Revert "Add IPC benchmarking API to Blink TestRunner"

content/shell/renderer/ipc_echo.h

Index: content/shell/renderer/ipc_echo.h
diff --git a/content/shell/renderer/ipc_echo.h b/content/shell/renderer/ipc_echo.h
deleted file mode 100644
index 4e2884a37dde9042b89e8265a3c425acf3286378..0000000000000000000000000000000000000000
--- a/content/shell/renderer/ipc_echo.h
+++ /dev/null
@@ -1,46 +0,0 @@
-// Copyright 2014 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 CONTENT_SHELL_IPC_ECHO_H_
-#define CONTENT_SHELL_IPC_ECHO_H_
-
-#include <utility>
-#include <vector>
-#include "base/compiler_specific.h"
-#include "third_party/WebKit/public/web/WebDocument.h"
-
-namespace IPC {
-class Sender;
-}
-
-namespace content {
-
-// This class is for writing micro benchmarks exercising underlying
-// IPC::Channel using HTML and JavaScript.
-//
-// TODO(morrita): The benchmark effort tries to makesure that
-// IPC::ChannelMojo is as performant as native IPC::Channel
-// implementations. Currently IPC::ChannelMojo is hidden behind
-// "--enable-renderer-mojo-channel". Once it is turned on by default.
-// we no longer need this class and should remove it.
-class IPCEcho {
- public:
-  IPCEcho(blink::WebDocument document, IPC::Sender* sender, int routing_id);
-
-  void RequestEcho(int id, int size);
-  void DidRespondEcho(int id, int size);
-
-  int last_echo_id() const { return last_echo_id_; }
-  int last_echo_size() const { return last_echo_size_; }
-
-  blink::WebDocument document_;
-  IPC::Sender* sender_;
-  int routing_id_;
-  int last_echo_id_;
-  int last_echo_size_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_SHELL_IPC_ECHO_DISPATCHER_H_