Remove calls to MessageLoop::current() in chrome.

chrome/browser/extensions/extension_install_prompt.h

 // Copyright (c) 2012 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_EXTENSIONS_EXTENSION_INSTALL_PROMPT_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_PROMPT_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
+#include "base/threading/thread_checker.h"
 #include "extensions/common/permissions/permission_message.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/native_widget_types.h"
 
 class ExtensionInstallPromptShowParams;
 class Profile;
 
 namespace base {
 class DictionaryValue;
-class MessageLoop;
 }  // namespace base
 
 namespace content {
 class BrowserContext;
 class WebContents;
 }
 
 namespace extensions {
 class CrxInstallError;
 class Extension;
@@ skipping 306 matching lines @@
   // Starts the process of showing a confirmation UI, which is split into two.
   // 1) Set off a 'load icon' task.
   // 2) Handle the load icon response and show the UI (OnImageLoaded).
   void LoadImageIfNeeded();
 
   // Shows the actual UI (the icon should already be loaded).
   void ShowConfirmation();
 
   Profile* profile_;
 
-  base::MessageLoop* ui_loop_;
+  base::ThreadChecker ui_thread_checker_;
 
   // The extensions installation icon.
   SkBitmap icon_;
 
   // The extension we are showing the UI for.
   const extensions::Extension* extension_;
 
   // A custom set of permissions to show in the install prompt instead of the
   // extension's active permissions.
   std::unique_ptr<const extensions::PermissionSet> custom_permissions_;
@@ skipping 15 matching lines @@
 
   // Whether or not the |show_dialog_callback_| was called.
   bool did_call_show_dialog_;
 
   base::WeakPtrFactory<ExtensionInstallPrompt> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionInstallPrompt);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_PROMPT_H_