[Code cleanup]Remove webui keyboard mojo binding

ui/keyboard/keyboard.cc

 // Copyright (c) 2013 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.
 
 #include "ui/keyboard/keyboard.h"
 
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 #include "ui/base/resource/resource_bundle.h"
-#include "ui/keyboard/webui/vk_webui_controller.h"
 
 namespace keyboard {
 
 static bool initialized = false;
 
 void ResetKeyboardForTesting() {
   initialized = false;
 }
 
 void InitializeKeyboard() {
   if (initialized)
     return;
   initialized = true;
 
   base::FilePath pak_dir;
   PathService::Get(base::DIR_MODULE, &pak_dir);
   base::FilePath pak_file = pak_dir.Append(
       FILE_PATH_LITERAL("keyboard_resources.pak"));
   ui::ResourceBundle::GetSharedInstance().AddDataPackFromPath(
       pak_file, ui::SCALE_FACTOR_100P);
 }
 
-void InitializeWebUIBindings() {
-  CHECK(initialized);
-  base::FilePath content_resources;
-  DCHECK(PathService::Get(base::DIR_MODULE, &content_resources));
-  content_resources =
-      content_resources.Append(FILE_PATH_LITERAL("content_resources.pak"));
-  ui::ResourceBundle::GetSharedInstance().AddDataPackFromPath(
-      content_resources, ui::SCALE_FACTOR_100P);
-
-  content::WebUIControllerFactory::RegisterFactory(
-      VKWebUIControllerFactory::GetInstance());
-}
-
 }  // namespace keyboard