Move rendering/RenderBox to layout/LayoutBox.

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/AnimationEffect.idl',
             'animation/AnimationNode.idl',
@@ skipping 569 matching lines @@
             'layout/LayerFilterInfo.cpp',
             'layout/LayerFilterInfo.h',
             'layout/LayerFragment.h',
             'layout/LayerPaintingInfo.h',
             'layout/LayerReflectionInfo.cpp',
             'layout/LayerScrollableArea.cpp',
             'layout/LayerStackingNode.cpp',
             'layout/LayerStackingNodeIterator.cpp',
             'layout/LayoutApplet.cpp',
             'layout/LayoutApplet.h',
+            'layout/LayoutBox.cpp',
             'layout/LayoutBoxModelObject.cpp',
             'layout/LayoutBR.cpp',
             'layout/LayoutCounter.cpp',
             'layout/LayoutCounter.h',
             'layout/LayoutDetailsMarker.cpp',
             'layout/LayoutDetailsMarker.h',
             'layout/LayoutEmbeddedObject.cpp',
             'layout/LayoutFieldset.cpp',
             'layout/LayoutFieldset.h',
             'layout/LayoutFlowThread.cpp',
@@ skipping 221 matching lines @@
             'layout/style/StyleWillChangeData.cpp',
             'layout/svg/line/SVGInlineFlowBox.cpp',
             'layout/svg/line/SVGInlineFlowBox.h',
             'layout/svg/line/SVGInlineTextBox.cpp',
             'layout/svg/line/SVGInlineTextBox.h',
             'layout/svg/line/SVGRootInlineBox.cpp',
             'layout/svg/line/SVGRootInlineBox.h',
             'rendering/RenderBlock.cpp',
             'rendering/RenderBlockFlow.cpp',
             'rendering/RenderBlockLineLayout.cpp',
-            'rendering/RenderBox.cpp',
             'rendering/RenderButton.cpp',
             'rendering/RenderButton.h',
             'rendering/RenderCombineText.cpp',
             'rendering/RenderCombineText.h',
             'rendering/RenderDeprecatedFlexibleBox.cpp',
             'rendering/RenderDeprecatedFlexibleBox.h',
             'rendering/RenderFileUploadControl.cpp',
             'rendering/RenderFileUploadControl.h',
             'rendering/RenderFlexibleBox.cpp',
             'rendering/RenderFlexibleBox.h',
@@ skipping 2964 matching lines @@
             'rendering/RenderOverflowTest.cpp',
             'streams/ExclusiveStreamReaderTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }