cmd/vendor/.../pprof: delete pprof.go file

The file is not used ('go tool' uses cmd/pprof/pprof.go instead)
and the external package import in this file causes test failure.

Fixes #25367

Change-Id: I71fbf8a3631efb1bd9e459b8247e5f7a6683894c
Reviewed-on: https://go-review.googlesource.com/113295Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/vendor/github.com/google/pprof/pprof.go

-// Copyright 2014 Google Inc. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// pprof is a tool for collection, manipulation and visualization
-// of performance profiles.
-package main
-
-import (
-	"fmt"
-	"os"
-	"strings"
-
-	"github.com/chzyer/readline"
-	"github.com/google/pprof/driver"
-)
-
-func main() {
-	if err := driver.PProf(&driver.Options{UI: newUI()}); err != nil {
-		fmt.Fprintf(os.Stderr, "pprof: %v\n", err)
-		os.Exit(2)
-	}
-}
-
-// readlineUI implements the driver.UI interface using the
-// github.com/chzyer/readline library.
-// This is contained in pprof.go to avoid adding the readline
-// dependency in the vendored copy of pprof in the Go distribution,
-// which does not use this file.
-type readlineUI struct {
-	rl *readline.Instance
-}
-
-func newUI() driver.UI {
-	rl, err := readline.New("")
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "readline: %v", err)
-		return nil
-	}
-	return &readlineUI{
-		rl: rl,
-	}
-}
-
-// Read returns a line of text (a command) read from the user.
-// prompt is printed before reading the command.
-func (r *readlineUI) ReadLine(prompt string) (string, error) {
-	r.rl.SetPrompt(prompt)
-	return r.rl.Readline()
-}
-
-// Print shows a message to the user.
-// It is printed over stderr as stdout is reserved for regular output.
-func (r *readlineUI) Print(args ...interface{}) {
-	text := fmt.Sprint(args...)
-	if !strings.HasSuffix(text, "\n") {
-		text += "\n"
-	}
-	fmt.Fprint(r.rl.Stderr(), text)
-}
-
-// Print shows a message to the user, colored in red for emphasis.
-// It is printed over stderr as stdout is reserved for regular output.
-func (r *readlineUI) PrintErr(args ...interface{}) {
-	text := fmt.Sprint(args...)
-	if !strings.HasSuffix(text, "\n") {
-		text += "\n"
-	}
-	fmt.Fprint(r.rl.Stderr(), colorize(text))
-}
-
-// colorize the msg using ANSI color escapes.
-func colorize(msg string) string {
-	var red = 31
-	var colorEscape = fmt.Sprintf("\033[0;%dm", red)
-	var colorResetEscape = "\033[0m"
-	return colorEscape + msg + colorResetEscape
-}
-
-// IsTerminal returns whether the UI is known to be tied to an
-// interactive terminal (as opposed to being redirected to a file).
-func (r *readlineUI) IsTerminal() bool {
-	const stdout = 1
-	return readline.IsTerminal(stdout)
-}
-
-// Start a browser on interactive mode.
-func (r *readlineUI) WantBrowser() bool {
-	return r.IsTerminal()
-}
-
-// SetAutoComplete instructs the UI to call complete(cmd) to obtain
-// the auto-completion of cmd, if the UI supports auto-completion at all.
-func (r *readlineUI) SetAutoComplete(complete func(string) string) {
-	// TODO: Implement auto-completion support.
-}