Remove calls to MessageLoop::Run/RunUntilIdle.

ios/web/public/test/web_test_with_web_state.mm

 // Copyright 2016 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.
 
 #import "ios/web/public/test/web_test_with_web_state.h"
 
+#include "base/run_loop.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/test/ios/wait_util.h"
 #import "ios/web/public/web_state/url_verification_constants.h"
 #include "ios/web/public/web_state/web_state_observer.h"
 #import "ios/web/web_state/ui/crw_web_controller.h"
 #import "ios/web/web_state/web_state_impl.h"
 
 namespace {
 // Returns CRWWebController for the given |web_state|.
 CRWWebController* GetWebController(web::WebState* web_state) {
@@ skipping 79 matching lines @@
     activitySeen = false;
 
     // Yield to the iOS message queue, e.g. [NSObject performSelector:] events.
     if (CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0, true) ==
         kCFRunLoopRunHandledSource)
       activitySeen = true;
 
     // Yield to the Chromium message queue, e.g. WebThread::PostTask()
     // events.
     processed_a_task_ = false;
-    messageLoop->RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
     if (processed_a_task_)  // Set in TaskObserver method.
       activitySeen = true;
 
   } while (activitySeen);
   messageLoop->RemoveTaskObserver(this);
 }
 
 void WebTestWithWebState::WaitForCondition(ConditionBlock condition) {
   base::MessageLoop* messageLoop = base::MessageLoop::current();
   DCHECK(messageLoop);
@@ skipping 31 matching lines @@
 
 void WebTestWithWebState::WillProcessTask(const base::PendingTask&) {
   // Nothing to do.
 }
 
 void WebTestWithWebState::DidProcessTask(const base::PendingTask&) {
   processed_a_task_ = true;
 }
 
 }  // namespace web