Update references to Blink's Platform API headers

cc/test/fake_web_scrollbar.h

 // 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.
 
 #ifndef CC_TEST_FAKE_WEB_SCROLLBAR_H_
 #define CC_TEST_FAKE_WEB_SCROLLBAR_H_
 
 #include "base/memory/scoped_ptr.h"
-#include "third_party/WebKit/Source/Platform/chromium/public/WebScrollbar.h"
+#include "third_party/WebKit/public/platform/WebScrollbar.h"
 
 namespace cc {
 
 class FakeWebScrollbar : public WebKit::WebScrollbar {
  public:
   static scoped_ptr<FakeWebScrollbar> Create() {
     return make_scoped_ptr(new FakeWebScrollbar());
   }
 
   void set_overlay(bool is_overlay) { is_overlay_ = is_overlay; }
@@ skipping 20 matching lines @@
 
  private:
   FakeWebScrollbar();
 
   bool is_overlay_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_WEB_SCROLLBAR_H_