Remove unnecessary includes of LayoutBlock-derived headers.

third_party/WebKit/Source/core/layout/LayoutThemeMobile.cpp

 /*
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 10 matching lines @@
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "core/layout/LayoutThemeMobile.h"
 
 #include "core/CSSValueKeywords.h"
 #include "core/InputTypeNames.h"
 #include "core/layout/LayoutObject.h"
-#include "core/layout/LayoutSlider.h"
 #include "platform/LayoutTestSupport.h"
 #include "platform/PlatformResourceLoader.h"
 #include "platform/graphics/Color.h"
 #include "platform/scroll/ScrollbarTheme.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebThemeEngine.h"
 #include "wtf/StdLibExtras.h"
 
 namespace blink {
 
@@ skipping 38 matching lines @@
 #if OS(MACOSX)
     // Mac WebThemeEngine cannot handle these controls.
     ControlPart part = style.appearance();
     if (part == CheckboxPart || part == RadioPart)
         return true;
 #endif
     return LayoutThemeDefault::shouldUseFallbackTheme(style);
 }
 
 } // namespace blink