Don't include headers from the layout API from other headers needlessly.

third_party/WebKit/Source/web/tests/TouchActionTest.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 22 matching lines @@
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/StaticNodeList.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "core/input/EventHandler.h"
 #include "core/layout/HitTestResult.h"
 #include "core/layout/LayoutTreeAsText.h"
+#include "core/layout/api/LayoutViewItem.h"
 #include "platform/testing/URLTestHelpers.h"
 #include "platform/testing/UnitTestHelpers.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebURLLoaderMockFactory.h"
 #include "public/web/WebCache.h"
 #include "public/web/WebDocument.h"
 #include "public/web/WebFrame.h"
 #include "public/web/WebHitTestResult.h"
 #include "public/web/WebInputEvent.h"
 #include "public/web/WebTouchAction.h"
@@ skipping 321 matching lines @@
 {
     runShadowDOMTest("touch-action-shadow-dom.html");
 }
 
 TEST_F(TouchActionTest, Pan)
 {
     runTouchActionTest("touch-action-pan.html");
 }
 
 } // namespace blink