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

ios/web/web_thread_impl.h

Index: ios/web/web_thread_impl.h
diff --git a/ios/web/web_thread_impl.h b/ios/web/web_thread_impl.h
index 7641c61b1d9125f53b264ef4639a801d9b695d99..adc59cd8dea4cb392bfc53cf6dfcceabb3eff576 100644
--- a/ios/web/web_thread_impl.h
+++ b/ios/web/web_thread_impl.h
@@ -28,7 +28,7 @@ class WebThreadImpl : public WebThread, public base::Thread {
 
  protected:
   void Init() override;
-  void Run(base::MessageLoop* message_loop) override;
+  void Run(base::RunLoop* run_loop) override;
   void CleanUp() override;
 
  private:
@@ -39,12 +39,12 @@ class WebThreadImpl : public WebThread, public base::Thread {
 
   // 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,