Eliminate unnecessary includes and pointless forward declarations in LayoutBlock.h

third_party/WebKit/Source/core/layout/LayoutRubyRun.h

 /*
  * Copyright (C) 2009 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 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 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.
  */
 
 #ifndef LayoutRubyRun_h
 #define LayoutRubyRun_h
 
 #include "core/layout/LayoutBlockFlow.h"
+#include "platform/text/TextBreakIterator.h"
 
 namespace blink {
 
 class LayoutRubyBase;
 class LayoutRubyText;
 
 // LayoutRubyRun are 'inline-block/table' like objects,and wrap a single pairing of a ruby base with its ruby text(s).
 // See LayoutRuby.h for further comments on the structure
 
 class LayoutRubyRun final : public LayoutBlockFlow {
@@ skipping 30 matching lines @@
     bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectRubyRun || LayoutBlockFlow::isOfType(type); }
     bool createsAnonymousWrapper() const override { return true; }
     void removeLeftoverAnonymousBlock(LayoutBlock*) override { }
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutRubyRun, isRubyRun());
 
 } // namespace blink
 
 #endif // LayoutRubyRun_h