ui: Use base::MessageLoop.

ui/views/widget/native_widget_aura_unittest.cc

Index: ui/views/widget/native_widget_aura_unittest.cc
diff --git a/ui/views/widget/native_widget_aura_unittest.cc b/ui/views/widget/native_widget_aura_unittest.cc
index d416ef751401a6c0b01ec4651cd151bd008107b0..13e7de542ef160994b9f2b19008ccf7aa1eb7de4 100644
--- a/ui/views/widget/native_widget_aura_unittest.cc
+++ b/ui/views/widget/native_widget_aura_unittest.cc
@@ -53,7 +53,7 @@ class NativeWidgetAuraTest : public testing::Test {
   aura::RootWindow* root_window() { return aura_test_helper_->root_window(); }
 
  private:
-  MessageLoopForUI message_loop_;
+  base::MessageLoopForUI message_loop_;
   scoped_ptr<aura::test::AuraTestHelper> aura_test_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetAuraTest);
@@ -404,7 +404,7 @@ TEST_F(NativeWidgetAuraTest, NoCrashOnThemeAfterClose) {
   NativeWidgetAura* window = Init(parent.get(), widget.get());
   window->Show();
   window->Close();
-  MessageLoop::current()->RunUntilIdle();
+  base::MessageLoop::current()->RunUntilIdle();
   widget->GetNativeTheme();  // Shouldn't crash.
 }