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

ios/web/web_thread_impl.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_WEB_THREAD_IMPL_H_
 #define IOS_WEB_WEB_THREAD_IMPL_H_
 
 #include "base/threading/thread.h"
 #include "ios/web/public/web_thread.h"
 
@@ skipping 10 matching lines @@
   // Special constructor for the main (UI) thread and unittests. If a
   // |message_loop| is provied, we use a dummy thread here since the main
   // thread already exists.
   WebThreadImpl(WebThread::ID identifier, base::MessageLoop* message_loop);
   ~WebThreadImpl() override;
 
   static void ShutdownThreadPool();
 
  protected:
   void Init() override;
-  void Run(base::MessageLoop* message_loop) override;
+  void Run(base::RunLoop* run_loop) override;
   void CleanUp() override;
 
  private:
   // This class implements all the functionality of the public WebThread
   // functions, but state is stored in the WebThreadImpl to keep
   // the API cleaner. Therefore make WebThread a friend class.
   friend class WebThread;
 
   // The following are unique function names that makes it possible to tell
   // the thread id from the callstack alone in crash dumps.
-  void UIThreadRun(base::MessageLoop* message_loop);
-  void DBThreadRun(base::MessageLoop* message_loop);
-  void FileThreadRun(base::MessageLoop* message_loop);
-  void FileUserBlockingThreadRun(base::MessageLoop* message_loop);
-  void CacheThreadRun(base::MessageLoop* message_loop);
-  void IOThreadRun(base::MessageLoop* message_loop);
+  void UIThreadRun(base::RunLoop* run_loop);
+  void DBThreadRun(base::RunLoop* run_loop);
+  void FileThreadRun(base::RunLoop* run_loop);
+  void FileUserBlockingThreadRun(base::RunLoop* run_loop);
+  void CacheThreadRun(base::RunLoop* run_loop);
+  void IOThreadRun(base::RunLoop* run_loop);
 
   static bool PostTaskHelper(WebThread::ID identifier,
                              const tracked_objects::Location& from_here,
                              const base::Closure& task,
                              base::TimeDelta delay,
                              bool nestable);
 
   // Common initialization code for the constructors.
   void Initialize();
 
   // Performs cleanup that needs to happen on the IO thread before calling the
   // embedder's CleanUp function.
   void IOThreadPreCleanUp();
 
   // For testing.
   friend class TestWebThreadBundle;
   friend class TestWebThreadBundleImpl;
   friend class WebTestSuiteListener;
   static void FlushThreadPoolHelperForTesting();
 
   // The identifier of this thread.  Only one thread can exist with a given
   // identifier at a given time.
   ID identifier_;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_WEB_THREAD_IMPL_H_