compress: move benchmark text from src/testdata to src/compress/testdata

This text is used mainly for benchmark compression testing, and in one
net test. The text was prevoiusly in a src/testdata directory, but since
that directory would only include one file, the text is moved to the
existing src/compression/testdata directory.

This does not cause any change to the benchmark results.

Updates #27151

Change-Id: I38ab5089dfe744189a970947d15be50ef1d48517
Reviewed-on: https://go-review.googlesource.com/138495
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

misc/nacl/testzip.proto

@@ -177,8 +177,6 @@ go	src=..
 		strconv
 			testdata
 				+
-		testdata
-			+
 		text
 			template
 				testdata

src/compress/flate/deflate_test.go

@@ -371,7 +371,7 @@ var deflateInflateStringTests = []deflateInflateStringTest{
 		[...]int{100018, 50650, 50960, 51150, 50930, 50790, 50790, 50790, 50790, 50790, 43683},
 	},
 	{
-		"../../testdata/Isaac.Newton-Opticks.txt",
+		"../testdata/Isaac.Newton-Opticks.txt",
 		"Isaac.Newton-Opticks",
 		[...]int{567248, 218338, 198211, 193152, 181100, 175427, 175427, 173597, 173422, 173422, 325240},
 	},
@@ -654,7 +654,7 @@ func (w *failWriter) Write(b []byte) (int, error) {
 
 func TestWriterPersistentError(t *testing.T) {
 	t.Parallel()
-	d, err := ioutil.ReadFile("../../testdata/Isaac.Newton-Opticks.txt")
+	d, err := ioutil.ReadFile("../testdata/Isaac.Newton-Opticks.txt")
 	if err != nil {
 		t.Fatalf("ReadFile: %v", err)
 	}

src/compress/flate/reader_test.go

@@ -28,7 +28,7 @@ var suites = []struct{ name, file string }{
 	// reasonably compressible.
 	{"Digits", "../testdata/e.txt"},
 	// Newton is Isaac Newtons's educational text on Opticks.
-	{"Newton", "../../testdata/Isaac.Newton-Opticks.txt"},
+	{"Newton", "../testdata/Isaac.Newton-Opticks.txt"},
 }
 
 func BenchmarkDecode(b *testing.B) {

src/net/sendfile_test.go

@@ -17,7 +17,7 @@ import (
 )
 
 const (
-	newton       = "../testdata/Isaac.Newton-Opticks.txt"
+	newton       = "../compress/testdata/Isaac.Newton-Opticks.txt"
 	newtonLen    = 567198
 	newtonSHA256 = "d4a9ac22462b35e7821a4f2706c211093da678620a8f9997989ee7cf8d507bbd"
 )