ui: Replace MessageLoopProxy usage with ThreadTaskRunnerHandle.

ui/compositor/test/test_compositor_host_mac.mm

Index: ui/compositor/test/test_compositor_host_mac.mm
diff --git a/ui/compositor/test/test_compositor_host_mac.mm b/ui/compositor/test/test_compositor_host_mac.mm
index 8d533d08d41a243198fecab47b8ef1f8dc24d42a..d7b4ab2f3a547bb60d948b47d4e5f05185d6f408 100644
--- a/ui/compositor/test/test_compositor_host_mac.mm
+++ b/ui/compositor/test/test_compositor_host_mac.mm
@@ -13,7 +13,7 @@
 #include "base/compiler_specific.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/message_loop/message_loop.h"
+#include "base/thread_task_runner_handle.h"
 #include "ui/compositor/compositor.h"
 #include "ui/gfx/rect.h"
 
@@ -133,7 +133,7 @@ void TestCompositorHostMac::Show() {
       [[AcceleratedTestView alloc] init]);
   compositor_.reset(new ui::Compositor(view,
                                        context_factory_,
-                                       base::MessageLoopProxy::current()));
+                                       base::ThreadTaskRunnerHandle::Get()));
   compositor_->SetScaleAndSize(1.0f, bounds_.size());
   [view setCompositor:compositor_.get()];
   [window_ setContentView:view];