Create Source/modules/accessibility/ and move most of core/accessibility/* into it

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 319 matching lines @@
       '<(blink_modules_output_dir)/serviceworkers/ServiceWorkerClientQueryOptions.h',
       '<(blink_modules_output_dir)/webmidi/MIDIOptions.cpp',
       '<(blink_modules_output_dir)/webmidi/MIDIOptions.h',
     ],
     'modules_files': [
       '<@(extra_blink_module_files)',
       '<@(generated_modules_dictionary_files)',
       '<@(generated_modules_files)',
       'InitModules.cpp',
       'InitModules.h',
+      'accessibility/AXARIAGrid.cpp',
+      'accessibility/AXARIAGrid.h',
+      'accessibility/AXARIAGridCell.cpp',
+      'accessibility/AXARIAGridCell.h',
+      'accessibility/AXARIAGridRow.cpp',
+      'accessibility/AXARIAGridRow.h',
+      'accessibility/AXImageMapLink.cpp',
+      'accessibility/AXImageMapLink.h',
+      'accessibility/AXInlineTextBox.cpp',
+      'accessibility/AXInlineTextBox.h',
+      'accessibility/AXList.cpp',
+      'accessibility/AXList.h',
+      'accessibility/AXListBox.cpp',
+      'accessibility/AXListBox.h',
+      'accessibility/AXListBoxOption.cpp',
+      'accessibility/AXListBoxOption.h',
+      'accessibility/AXMediaControls.cpp',
+      'accessibility/AXMediaControls.h',
+      'accessibility/AXMenuList.cpp',
+      'accessibility/AXMenuList.h',
+      'accessibility/AXMenuListOption.cpp',
+      'accessibility/AXMenuListOption.h',
+      'accessibility/AXMenuListPopup.cpp',
+      'accessibility/AXMenuListPopup.h',
+      'accessibility/AXMockObject.cpp',
+      'accessibility/AXMockObject.h',
+      '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/AXRenderObject.cpp',
+      'accessibility/AXRenderObject.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',
+      'accessibility/AXTableHeaderContainer.cpp',
+      'accessibility/AXTableHeaderContainer.h',
+      'accessibility/AXTableRow.cpp',
+      'accessibility/AXTableRow.h',
       'battery/BatteryDispatcher.cpp',
       'battery/BatteryDispatcher.h',
       'battery/BatteryManager.cpp',
       'battery/BatteryManager.h',
       'battery/BatteryStatus.cpp',
       'battery/BatteryStatus.h',
       'battery/NavigatorBattery.cpp',
       'battery/NavigatorBattery.h',
       'beacon/NavigatorBeacon.cpp',
       'beacon/NavigatorBeacon.h',
@@ skipping 705 matching lines @@
       'serviceworkers/CacheTest.cpp',
       'serviceworkers/FetchResponseDataTest.cpp',
       'serviceworkers/RequestTest.cpp',
       'serviceworkers/ResponseTest.cpp',
       'serviceworkers/ServiceWorkerContainerTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }