One AXObjectCache per frame

Source/modules/modules.gypi

 {
   'includes': [
     '../core/core_generated.gypi',
     'modules_generated.gypi',
   ],
   'variables': {
     # Experimental hooks for embedder to provide extra IDL and source files.
     #
     # Note: this is not a supported API. If you rely on this, you will be broken
     # from time to time as the code generator changes in backward incompatible
@@ skipping 665 matching lines @@
       'accessibility/AXNodeObject.cpp',
       'accessibility/AXNodeObject.h',
       'accessibility/AXObjectCacheImpl.cpp',
       'accessibility/AXObjectCacheImpl.h',
       'accessibility/AXObject.cpp',
       'accessibility/AXObject.h',
       'accessibility/AXProgressIndicator.cpp',
       'accessibility/AXProgressIndicator.h',
       'accessibility/AXSVGRoot.cpp',
       'accessibility/AXSVGRoot.h',
-      'accessibility/AXScrollView.cpp',
-      'accessibility/AXScrollView.h',
-      'accessibility/AXScrollbar.cpp',
-      'accessibility/AXScrollbar.h',
       'accessibility/AXSlider.cpp',
       'accessibility/AXSlider.h',
       'accessibility/AXSpinButton.cpp',
       'accessibility/AXSpinButton.h',
       'accessibility/AXTable.cpp',
       'accessibility/AXTable.h',
       'accessibility/AXTableCell.cpp',
       'accessibility/AXTableCell.h',
       'accessibility/AXTableColumn.cpp',
       'accessibility/AXTableColumn.h',
@@ skipping 1120 matching lines @@
       'webaudio/AudioBasicProcessorHandlerTest.cpp',
       'webaudio/ConvolverNodeTest.cpp',
       'webaudio/DynamicsCompressorNodeTest.cpp',
       'webaudio/ScriptProcessorNodeTest.cpp',
       'webaudio/StereoPannerNodeTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }