Remove ScrollbarTestSuite from platform/scroll

third_party/WebKit/Source/platform/scroll/ScrollbarTestSuite.h

 // Copyright 2016 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 ScrollbarTestSuite_h
 #define ScrollbarTestSuite_h
 
 #include "platform/heap/GarbageCollected.h"
 #include "platform/scroll/ScrollableArea.h"
 #include "platform/scroll/Scrollbar.h"
 #include "platform/scroll/ScrollbarThemeMock.h"
-#include "platform/testing/TestingPlatformSupport.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "wtf/PtrUtil.h"
 #include <memory>
 
 namespace blink {
 
 class MockScrollableArea : public GarbageCollectedFinalized<MockScrollableArea>,
                            public ScrollableArea {
   USING_GARBAGE_COLLECTED_MIXIN(MockScrollableArea);
 
@@ skipping 52 matching lines @@
 
  private:
   void setMaximumScrollOffset(const ScrollOffset& maximumScrollOffset) {
     m_maximumScrollOffset = maximumScrollOffset;
   }
 
   ScrollOffset m_scrollOffset;
   ScrollOffset m_maximumScrollOffset;
 };
 
-class ScrollbarTestSuite : public testing::Test {
- public:
-  ScrollbarTestSuite() {}
-
-  void SetUp() override {
-    m_config.compositorSupport = Platform::current()->compositorSupport();

[Takashi Toyoshima, 2017/01/12 13:19:47]

We already have the same logic inside TestingPlatformSupport.
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/platform/testi...

-  }
-
- protected:
-  TestingPlatformSupport::Config m_config;
-};
-
 }  // namespace blink
 
 #endif