Remove BrowserThread::UnsafeGetMessageLoopForThread()

ios/web/public/web_thread.h

 // 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 IOS_WEB_PUBLIC_WEB_THREAD_H_
 #define IOS_WEB_PUBLIC_WEB_THREAD_H_
 
 #include <string>
 
 #include "base/callback_forward.h"
@@ skipping 156 matching lines @@
       const base::Closure& reply);
   static bool PostBlockingPoolSequencedTask(
       const std::string& sequence_token_name,
       const tracked_objects::Location& from_here,
       const base::Closure& task);
 
   // Returns the thread pool used for blocking file I/O. Use this object to
   // perform random blocking operations such as file writes.
   static base::SequencedWorkerPool* GetBlockingPool() WARN_UNUSED_RESULT;
 
-  // Returns a pointer to the thread's message loop, which will become
-  // invalid during shutdown, so you probably shouldn't hold onto it.
-  //
-  // This must not be called before the thread is started, or after
-  // the thread is stopped, or it will DCHECK.
-  //
-  // Ownership remains with the WebThread implementation, so you must not
-  // delete the pointer.
-  static base::MessageLoop* UnsafeGetMessageLoopForThread(ID identifier);
-
   // Callable on any thread.  Returns whether the given well-known thread is
   // initialized.
   static bool IsThreadInitialized(ID identifier) WARN_UNUSED_RESULT;
 
   // Callable on any thread.  Returns whether execution is currently on the
   // given thread.  To DCHECK this, use the DCHECK_CURRENTLY_ON() macro above.
   static bool CurrentlyOn(ID identifier) WARN_UNUSED_RESULT;
 
   // Callable on any thread.  Returns whether the threads message loop is valid.
   // If this returns false it means the thread is in the process of shutting
@@ skipping 72 matching lines @@
  private:
   friend class WebThreadImpl;
 
   WebThread() {}
   DISALLOW_COPY_AND_ASSIGN(WebThread);
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_WEB_THREAD_H_