Remove the Pagination struct, clean up viewport scroll policy propagation.

Source/core/core.gypi

 {
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/Player.idl',
             'animation/TimedItem.idl',
             'clipboard/Clipboard.idl',
             'clipboard/DataTransferItem.idl',
             'clipboard/DataTransferItemList.idl',
@@ skipping 1381 matching lines @@
             'rendering/ImageQualityController.h',
             'rendering/InlineBox.cpp',
             'rendering/InlineFlowBox.cpp',
             'rendering/InlineIterator.h',
             'rendering/InlineTextBox.cpp',
             'rendering/LayoutRectRecorder.cpp',
             'rendering/LayoutRepainter.cpp',
             'rendering/LayoutState.cpp',
             'rendering/OrderIterator.cpp',
             'rendering/OrderIterator.h',
-            'rendering/Pagination.cpp',
-            'rendering/Pagination.h',
             'rendering/PartialLayoutState.h',
             'rendering/PointerEventsHitRules.cpp',
             'rendering/PointerEventsHitRules.h',
             'rendering/RenderApplet.cpp',
             'rendering/RenderApplet.h',
             'rendering/RenderBR.cpp',
             'rendering/RenderBlock.cpp',
             'rendering/RenderBlockFlow.cpp',
             'rendering/RenderBlockLineLayout.cpp',
             'rendering/RenderBox.cpp',
@@ skipping 1855 matching lines @@
             'html/parser/HTMLParserThreadTest.cpp',
             'html/track/vtt/BufferedLineReaderTest.cpp',
             'html/track/vtt/VTTScannerTest.cpp',
             'rendering/RenderOverflowTest.cpp',
             'rendering/shapes/BoxShapeTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
         ],
     }
 }