Have getElementsByClassName() / getElementsByTagName*() return an HTMLCollection

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',
             'css/CSS.idl',
             'css/CSSCharsetRule.idl',
             'css/CSSFontFaceLoadEvent.idl',
@@ skipping 1827 matching lines @@
             'dom/AddConsoleMessageTask.h',
             'dom/Attr.cpp',
             'dom/CDATASection.cpp',
             'dom/CDATASection.h',
             'dom/CSSSelectorWatch.cpp',
             'dom/CharacterData.cpp',
             'dom/ChildListMutationScope.cpp',
             'dom/ChildListMutationScope.h',
             'dom/ChildNodeList.cpp',
             'dom/ChildNodeList.h',
-            'dom/ClassNodeList.cpp',
-            'dom/ClassNodeList.h',
+            'dom/ClassCollection.cpp',
+            'dom/ClassCollection.h',
             'dom/ClientRect.cpp',
             'dom/ClientRect.h',
             'dom/ClientRectList.cpp',
             'dom/ClientRectList.h',
             'dom/Clipboard.cpp',
             'dom/Comment.cpp',
             'dom/Comment.h',
             'dom/ContainerNode.cpp',
             'dom/ContainerNodeAlgorithms.cpp',
             'dom/ContainerNodeAlgorithms.h',
@@ skipping 226 matching lines @@
             'dom/StyleElement.cpp',
             'dom/StyleElement.h',
             'dom/StyleEngine.cpp',
             'dom/StyleEngine.h',
             'dom/StyleSheetCandidate.cpp',
             'dom/StyleSheetCandidate.h',
             'dom/StyleSheetCollection.cpp',
             'dom/StyleSheetCollection.h',
             'dom/StyleSheetScopingNodeList.cpp',
             'dom/StyleSheetScopingNodeList.h',
-            'dom/TagNodeList.cpp',
-            'dom/TagNodeList.h',
+            'dom/TagCollection.cpp',
+            'dom/TagCollection.h',
             'dom/Text.cpp',
             'dom/TextLinkColors.cpp',
             'dom/TextLinkColors.h',
             'dom/Touch.cpp',
             'dom/Touch.h',
             'dom/TouchList.cpp',
             'dom/TouchList.h',
             'dom/TransformSource.h',
             'dom/TransformSourceLibxslt.cpp',
             'dom/Traversal.cpp',
@@ skipping 1159 matching lines @@
             'html/track/vtt/BufferedLineReaderTest.cpp',
             'html/track/vtt/VTTScannerTest.cpp',
             'frame/ImageBitmapTest.cpp',
             'rendering/RenderOverflowTest.cpp',
             'rendering/shapes/BoxShapeTest.cpp',
             'testing/UnitTestHelpers.h',
             'testing/UnitTestHelpers.cpp',
         ],
     }
 }