Move DOMSelection.[cpp/h] from core/page to core/editing

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/AnimationPlayer.idl',
@@ skipping 75 matching lines @@
             'dom/Range.idl',
             'dom/RequestAnimationFrameCallback.idl',
             'dom/StringCallback.idl',
             'dom/Text.idl',
             'dom/Touch.idl',
             'dom/TouchList.idl',
             'dom/TreeWalker.idl',
             'dom/URL.idl',
             'dom/XMLDocument.idl',
             'dom/shadow/ShadowRoot.idl',
+            'editing/Selection.idl',
             'events/AnimationPlayerEvent.idl',
             'events/ApplicationCacheErrorEvent.idl',
             'events/AutocompleteErrorEvent.idl',
             'events/BeforeUnloadEvent.idl',
             'events/CompositionEvent.idl',
             'events/CustomEvent.idl',
             'events/ErrorEvent.idl',
             'events/Event.idl',
             'events/EventTarget.idl',
             'events/FocusEvent.idl',
@@ skipping 171 matching lines @@
             'html/track/vtt/VTTCue.idl',
             'html/track/vtt/VTTRegion.idl',
             'html/track/vtt/VTTRegionList.idl',
             'inspector/InjectedScriptHost.idl',
             'inspector/InspectorFrontendHost.idl',
             'inspector/InspectorOverlayHost.idl',
             'inspector/JavaScriptCallFrame.idl',
             'loader/appcache/ApplicationCache.idl',
             'page/EventSource.idl',
             'page/PagePopupController.idl',
-            'page/Selection.idl',
             'plugins/MimeType.idl',
             'plugins/MimeTypeArray.idl',
             'plugins/Plugin.idl',
             'plugins/PluginArray.idl',
             'storage/Storage.idl',
             'storage/StorageEvent.idl',
             'streams/ReadableStream.idl',
             'streams/Stream.idl',
             'svg/SVGAElement.idl',
             'svg/SVGAltGlyphDefElement.idl',
@@ skipping 690 matching lines @@
             'editing/Caret.h',
             'editing/CompositeEditCommand.cpp',
             'editing/CompositionUnderline.h',
             'editing/CompositionUnderlineRangeFilter.cpp',
             'editing/CompositionUnderlineRangeFilter.h',
             'editing/CreateLinkCommand.cpp',
             'editing/CreateLinkCommand.h',
             'editing/DeleteFromTextNodeCommand.cpp',
             'editing/DeleteFromTextNodeCommand.h',
             'editing/DeleteSelectionCommand.cpp',
+            'editing/DOMSelection.cpp',
+            'editing/DOMSelection.h',
             'editing/EditCommand.cpp',
             'editing/EditingBehavior.cpp',
             'editing/EditingBehavior.h',
             'editing/EditingStyle.cpp',
             'editing/Editor.cpp',
             'editing/EditorCommand.cpp',
             'editing/EditorKeyBindings.cpp',
             'editing/FormatBlockCommand.cpp',
             'editing/FormatBlockCommand.h',
             'editing/FrameSelection.cpp',
@@ skipping 409 matching lines @@
             'loader/appcache/ApplicationCacheHost.cpp',
             'loader/appcache/ApplicationCacheHost.h',
             'page/AutoscrollController.cpp',
             'page/AutoscrollController.h',
             'page/BackForwardClient.h',
             'page/Chrome.cpp',
             'page/ContextMenuController.cpp',
             'page/ContextMenuProvider.h',
             'page/CreateWindow.cpp',
             'page/CreateWindow.h',
-            'page/DOMSelection.cpp',
-            'page/DOMSelection.h',
             'page/DOMWindowPagePopup.cpp',
             'page/DOMWindowPagePopup.h',
             'page/DragController.cpp',
             'page/DragData.cpp',
             'page/EventHandler.cpp',
             'page/EventSource.cpp',
             'page/EventSource.h',
             'page/EventWithHitTestResults.h',
             'page/FocusController.cpp',
             'page/FocusType.h',
@@ skipping 2022 matching lines @@
             'rendering/shapes/BoxShapeTest.cpp',
             'rendering/style/OutlineValueTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }