Remove remaining calls to deprecated MessageLoop methods on Mac.

ui/base/test/scoped_fake_nswindow_fullscreen.mm

 // Copyright 2015 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 "ui/base/test/scoped_fake_nswindow_fullscreen.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/bind.h"
 #import "base/mac/foundation_util.h"
 #import "base/mac/mac_util.h"
 #import "base/mac/scoped_nsobject.h"
 #import "base/mac/scoped_objc_class_swizzler.h"
 #import "base/mac/sdk_forward_declarations.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/threading/thread_task_runner_handle.h"
 
 // This method exists on NSWindowDelegate on 10.7+.
 // To build on 10.6, we just need to declare it somewhere. We'll test
 // -[NSObject respondsToSelector] before calling it.
 #if !defined(MAC_OS_X_VERSION_10_7) || \
     MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7
 @protocol NSWindowDelegateLion
 - (NSSize)window:(NSWindow*)window
     willUseFullScreenContentSize:(NSSize)proposedSize;
 @end
@@ skipping 81 matching lines @@
       fullscreen_content_size = [delegate window:window
                     willUseFullScreenContentSize:fullscreen_content_size];
     }
     [[NSNotificationCenter defaultCenter]
         postNotificationName:NSWindowWillEnterFullScreenNotification
                       object:window];
     // Starting with 10.11, OSX also posts LiveResize notifications.
     [[NSNotificationCenter defaultCenter]
         postNotificationName:NSWindowWillStartLiveResizeNotification
                       object:window];
-    base::MessageLoopForUI::current()->PostTask(
+    DCHECK(base::MessageLoopForUI::IsCurrent());
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::Bind(&Impl::FinishEnterFullscreen,
                               base::Unretained(this), fullscreen_content_size));
   }
 
   void FinishEnterFullscreen(NSSize fullscreen_content_size) {
     // The frame should not have changed during the transition.
     DCHECK(NSEqualRects(frame_before_fullscreen_, [window_ frame]));
 
     // Style mask must be set first because -[NSWindow frame] may be different
     // depending on NSFullScreenWindowMask. Don't call -[NSWindow setStyleMask:]
@@ skipping 17 matching lines @@
     frame_during_fullscreen_ = [window_ frame];
     is_in_transition_ = false;
   }
 
   void StartExitFullscreen() {
     is_in_transition_ = true;
     [[NSNotificationCenter defaultCenter]
         postNotificationName:NSWindowWillExitFullScreenNotification
                       object:window_];
 
-    base::MessageLoopForUI::current()->PostTask(
+    DCHECK(base::MessageLoopForUI::IsCurrent());
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
         base::Bind(&Impl::FinishExitFullscreen, base::Unretained(this)));
   }
 
   void FinishExitFullscreen() {
     // The bounds may have changed during the transition. Check for this before
     // setting the style mask because -[NSWindow frame] may be different
     // depending on NSFullScreenWindowMask.
     bool no_frame_change_during_fullscreen =
         NSEqualRects(frame_during_fullscreen_, [window_ frame]);
@@ skipping 69 matching lines @@
   if ((newMask ^ currentMask) & NSFullScreenWindowMask) {
     // Since 10.11, OSX triggers fullscreen transitions via setStyleMask, but
     // the faker doesn't attempt to fake them yet.
     NOTREACHED() << "Can't set NSFullScreenWindowMask while faking fullscreen.";
   }
   newMask &= ~NSFullScreenWindowMask;
   g_fake_fullscreen_impl->SetStyleMaskImplementation()(self, _cmd, newMask);
 }
 
 @end