vendor: update golang.org/x/net/http2/hpack

Updates golang.org/x/net/http2/hpack to x/net git rev 4dbf598 for:

   http2/hpack: remove unused pair function from package
   https://golang.org/cl/43851

   http2/hpack: remove pair function and initialize directly
   https://golang.org/cl/43190

   http2/hpack: move initialization to a static table
   https://golang.org/cl/43090

Updates #6853

Change-Id: I933a094623143c7333a0da7867d5d2e41da05234
Reviewed-on: https://go-review.googlesource.com/44007
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Tom Bergan <tombergan@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/vendor/golang_org/x/net/http2/hpack/hpack_test.go

@@ -648,6 +648,10 @@ func TestHuffmanFuzzCrash(t *testing.T) {
 	}
 }
 
+func pair(name, value string) HeaderField {
+	return HeaderField{Name: name, Value: value}
+}
+
 func dehex(s string) []byte {
 	s = strings.Replace(s, " ", "", -1)
 	s = strings.Replace(s, "\n", "", -1)

src/vendor/golang_org/x/net/http2/hpack/tables.go

@@ -125,77 +125,78 @@ func (t *headerFieldTable) idToIndex(id uint64) uint64 {
 	return k + 1
 }
 
-func pair(name, value string) HeaderField {
-	return HeaderField{Name: name, Value: value}
-}
-
 // http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-07#appendix-B
 var staticTable = newStaticTable()
+var staticTableEntries = [...]HeaderField{
+	HeaderField{Name: ":authority"},
+	HeaderField{Name: ":method", Value: "GET"},
+	HeaderField{Name: ":method", Value: "POST"},
+	HeaderField{Name: ":path", Value: "/"},
+	HeaderField{Name: ":path", Value: "/index.html"},
+	HeaderField{Name: ":scheme", Value: "http"},
+	HeaderField{Name: ":scheme", Value: "https"},
+	HeaderField{Name: ":status", Value: "200"},
+	HeaderField{Name: ":status", Value: "204"},
+	HeaderField{Name: ":status", Value: "206"},
+	HeaderField{Name: ":status", Value: "304"},
+	HeaderField{Name: ":status", Value: "400"},
+	HeaderField{Name: ":status", Value: "404"},
+	HeaderField{Name: ":status", Value: "500"},
+	HeaderField{Name: "accept-charset"},
+	HeaderField{Name: "accept-encoding", Value: "gzip, deflate"},
+	HeaderField{Name: "accept-language"},
+	HeaderField{Name: "accept-ranges"},
+	HeaderField{Name: "accept"},
+	HeaderField{Name: "access-control-allow-origin"},
+	HeaderField{Name: "age"},
+	HeaderField{Name: "allow"},
+	HeaderField{Name: "authorization"},
+	HeaderField{Name: "cache-control"},
+	HeaderField{Name: "content-disposition"},
+	HeaderField{Name: "content-encoding"},
+	HeaderField{Name: "content-language"},
+	HeaderField{Name: "content-length"},
+	HeaderField{Name: "content-location"},
+	HeaderField{Name: "content-range"},
+	HeaderField{Name: "content-type"},
+	HeaderField{Name: "cookie"},
+	HeaderField{Name: "date"},
+	HeaderField{Name: "etag"},
+	HeaderField{Name: "expect"},
+	HeaderField{Name: "expires"},
+	HeaderField{Name: "from"},
+	HeaderField{Name: "host"},
+	HeaderField{Name: "if-match"},
+	HeaderField{Name: "if-modified-since"},
+	HeaderField{Name: "if-none-match"},
+	HeaderField{Name: "if-range"},
+	HeaderField{Name: "if-unmodified-since"},
+	HeaderField{Name: "last-modified"},
+	HeaderField{Name: "link"},
+	HeaderField{Name: "location"},
+	HeaderField{Name: "max-forwards"},
+	HeaderField{Name: "proxy-authenticate"},
+	HeaderField{Name: "proxy-authorization"},
+	HeaderField{Name: "range"},
+	HeaderField{Name: "referer"},
+	HeaderField{Name: "refresh"},
+	HeaderField{Name: "retry-after"},
+	HeaderField{Name: "server"},
+	HeaderField{Name: "set-cookie"},
+	HeaderField{Name: "strict-transport-security"},
+	HeaderField{Name: "transfer-encoding"},
+	HeaderField{Name: "user-agent"},
+	HeaderField{Name: "vary"},
+	HeaderField{Name: "via"},
+	HeaderField{Name: "www-authenticate"},
+}
 
 func newStaticTable() *headerFieldTable {
 	t := &headerFieldTable{}
 	t.init()
-	t.addEntry(pair(":authority", ""))
-	t.addEntry(pair(":method", "GET"))
-	t.addEntry(pair(":method", "POST"))
-	t.addEntry(pair(":path", "/"))
-	t.addEntry(pair(":path", "/index.html"))
-	t.addEntry(pair(":scheme", "http"))
-	t.addEntry(pair(":scheme", "https"))
-	t.addEntry(pair(":status", "200"))
-	t.addEntry(pair(":status", "204"))
-	t.addEntry(pair(":status", "206"))
-	t.addEntry(pair(":status", "304"))
-	t.addEntry(pair(":status", "400"))
-	t.addEntry(pair(":status", "404"))
-	t.addEntry(pair(":status", "500"))
-	t.addEntry(pair("accept-charset", ""))
-	t.addEntry(pair("accept-encoding", "gzip, deflate"))
-	t.addEntry(pair("accept-language", ""))
-	t.addEntry(pair("accept-ranges", ""))
-	t.addEntry(pair("accept", ""))
-	t.addEntry(pair("access-control-allow-origin", ""))
-	t.addEntry(pair("age", ""))
-	t.addEntry(pair("allow", ""))
-	t.addEntry(pair("authorization", ""))
-	t.addEntry(pair("cache-control", ""))
-	t.addEntry(pair("content-disposition", ""))
-	t.addEntry(pair("content-encoding", ""))
-	t.addEntry(pair("content-language", ""))
-	t.addEntry(pair("content-length", ""))
-	t.addEntry(pair("content-location", ""))
-	t.addEntry(pair("content-range", ""))
-	t.addEntry(pair("content-type", ""))
-	t.addEntry(pair("cookie", ""))
-	t.addEntry(pair("date", ""))
-	t.addEntry(pair("etag", ""))
-	t.addEntry(pair("expect", ""))
-	t.addEntry(pair("expires", ""))
-	t.addEntry(pair("from", ""))
-	t.addEntry(pair("host", ""))
-	t.addEntry(pair("if-match", ""))
-	t.addEntry(pair("if-modified-since", ""))
-	t.addEntry(pair("if-none-match", ""))
-	t.addEntry(pair("if-range", ""))
-	t.addEntry(pair("if-unmodified-since", ""))
-	t.addEntry(pair("last-modified", ""))
-	t.addEntry(pair("link", ""))
-	t.addEntry(pair("location", ""))
-	t.addEntry(pair("max-forwards", ""))
-	t.addEntry(pair("proxy-authenticate", ""))
-	t.addEntry(pair("proxy-authorization", ""))
-	t.addEntry(pair("range", ""))
-	t.addEntry(pair("referer", ""))
-	t.addEntry(pair("refresh", ""))
-	t.addEntry(pair("retry-after", ""))
-	t.addEntry(pair("server", ""))
-	t.addEntry(pair("set-cookie", ""))
-	t.addEntry(pair("strict-transport-security", ""))
-	t.addEntry(pair("transfer-encoding", ""))
-	t.addEntry(pair("user-agent", ""))
-	t.addEntry(pair("vary", ""))
-	t.addEntry(pair("via", ""))
-	t.addEntry(pair("www-authenticate", ""))
+	for _, e := range staticTableEntries[:] {
+		t.addEntry(e)
+	}
 	return t
 }