Remove unnecessary message_loop_proxy.h includes

cc/trees/layer_tree_host_unittest_damage.cc

 // Copyright 2012 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 "cc/trees/layer_tree_host.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
-#include "base/message_loop/message_loop_proxy.h"
 #include "base/time/time.h"
 #include "cc/layers/solid_color_layer.h"
 #include "cc/test/fake_content_layer_client.h"
 #include "cc/test/fake_painted_scrollbar_layer.h"
 #include "cc/test/fake_picture_layer.h"
 #include "cc/test/layer_tree_test.h"
 #include "cc/trees/damage_tracker.h"
 #include "cc/trees/layer_tree_impl.h"
 
 namespace cc {
@@ skipping 505 matching lines @@
 
   void AfterTest() override { EXPECT_EQ(3, did_swaps_); }
 
   int did_swaps_;
 };
 
 MULTI_THREAD_TEST_F(LayerTreeHostDamageTestScrollbarCommitDoesNoDamage);
 
 }  // namespace
 }  // namespace cc