[Sync] Remove now-obsolete FastDump class

chrome/browser/sync/util/fast_dump.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_SYNC_UTIL_FAST_DUMP_H_
-#define CHROME_BROWSER_SYNC_UTIL_FAST_DUMP_H_
-#pragma once
-
-#include <ostream>
-#include <streambuf>
-#include <string>
-
-#include "base/string_number_conversions.h"
-
-using std::ostream;
-using std::streambuf;
-using std::string;
-
-// This seems totally gratuitous, and it would be if std::ostream was fast, but
-// std::ostream is slow. It's slow because it creates a ostream::sentry (mutex)
-// for every little << operator. When you want to dump a whole lot of stuff
-// under a single mutex lock, use this FastDump class.
-namespace browser_sync {
-class FastDump {
- public:
-  explicit FastDump(ostream* outs) : sentry_(*outs), out_(outs->rdbuf()) {
-  }
-  ostream::sentry sentry_;
-  streambuf* const out_;
-};
-
-inline FastDump& operator << (FastDump& dump, int64 n) {
-  string numbuf(base::Int64ToString(n));
-  const char* number = numbuf.c_str();
-  dump.out_->sputn(number, numbuf.length());
-  return dump;
-}
-
-inline FastDump& operator << (FastDump& dump, int32 n) {
-  string numbuf(base::IntToString(n));
-  const char* number = numbuf.c_str();
-  dump.out_->sputn(number, numbuf.length());
-  return dump;
-}
-
-inline FastDump& operator << (FastDump& dump, const char* s) {
-  dump.out_->sputn(s, strlen(s));
-  return dump;
-}
-
-inline FastDump& operator << (FastDump& dump, const string& s) {
-  dump.out_->sputn(s.data(), s.size());
-  return dump;
-}
-
-}  // namespace browser_sync
-
-#endif  // CHROME_BROWSER_SYNC_UTIL_FAST_DUMP_H_