Remove remaining calls to deprecated MessageLoop methods on Mac.

gpu/ipc/service/image_transport_surface_overlay_mac.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.
 
 #include "gpu/ipc/service/image_transport_surface_overlay_mac.h"
 
 #include <CoreGraphics/CoreGraphics.h>
 #include <IOSurface/IOSurface.h>
 #include <OpenGL/CGLRenderers.h>
 #include <OpenGL/CGLTypes.h>
 #include <OpenGL/gl.h>
 #include <stddef.h>
 
 #include <algorithm>
 
 // This type consistently causes problem on Mac, and needs to be dealt with
 // in a systemic way.
 // http://crbug.com/517208
 #ifndef GL_OES_EGL_image
 typedef void* GLeglImageOES;
 #endif
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/trace_event.h"
 #include "gpu/ipc/common/gpu_messages.h"
 #include "gpu/ipc/service/gpu_channel_manager.h"
 #include "gpu/ipc/service/gpu_channel_manager_delegate.h"
 #include "ui/accelerated_widget_mac/ca_layer_tree_coordinator.h"
 #include "ui/accelerated_widget_mac/io_surface_context.h"
 #include "ui/base/cocoa/animation_utils.h"
 #include "ui/base/cocoa/remote_layer_api.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 #include "ui/gfx/swap_result.h"
@@ skipping 338 matching lines @@
                       kCGLCPCurrentRendererID,
                       &context_renderer_id) != kCGLNoError) {
     LOG(ERROR) << "Failed to create test context after GPU switch";
     return;
   }
   gl_renderer_id_ = context_renderer_id & kCGLRendererIDMatchingMask;
 
   // Post a task holding a reference to the new GL context. The reason for
   // this is to avoid creating-then-destroying the context for every image
   // transport surface that is observing the GPU switch.
-  base::MessageLoop::current()->PostTask(
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(&IOSurfaceContextNoOp, context_on_new_gpu));
 }
 
 }  // namespace gpu