Update references to Blink's Platform API headers

cc/trees/layer_tree_host_unittest.cc

 // Copyright 2011 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 <algorithm>
 
 #include "base/synchronization/lock.h"
 #include "cc/animation/timing_function.h"
@@ skipping 18 matching lines @@
 #include "cc/test/geometry_test_utils.h"
 #include "cc/test/layer_tree_test.h"
 #include "cc/test/occlusion_tracker_test_common.h"
 #include "cc/trees/layer_tree_host_impl.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "cc/trees/single_thread_proxy.h"
 #include "cc/trees/thread_proxy.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "skia/ext/refptr.h"
 #include "testing/gmock/include/gmock/gmock.h"
-#include "third_party/WebKit/Source/Platform/chromium/public/WebSize.h"
+#include "third_party/WebKit/public/platform/WebSize.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "third_party/khronos/GLES2/gl2ext.h"
 #include "third_party/skia/include/core/SkPicture.h"
 #include "ui/gfx/point_conversions.h"
 #include "ui/gfx/size_conversions.h"
 #include "ui/gfx/vector2d_conversions.h"
 
 using testing::_;
 using testing::AnyNumber;
 using testing::AtLeast;
@@ skipping 2833 matching lines @@
 TEST_F(LayerTreeHostTestNumFramesPending, DelegatingRenderer) {
   RunTest(true, true, true);
 }
 
 TEST_F(LayerTreeHostTestNumFramesPending, GLRenderer) {
   RunTest(true, false, true);
 }
 
 }  // namespace
 }  // namespace cc