DevTools: make DOMNodeIds a trivial wrapper around WeakIdentifierMap

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/AnimationNode.idl',
@@ skipping 2332 matching lines @@
             'dom/TreeShared.h',
             'dom/TreeWalker.cpp',
             'dom/TreeWalker.h',
             'dom/UserActionElementSet.cpp',
             'dom/UserActionElementSet.h',
             'dom/ViewportDescription.cpp',
             'dom/ViewportDescription.h',
             'dom/VisitedLinkState.cpp',
             'dom/VisitedLinkState.h',
             'dom/WeakIdentifierMap.h',
-            'dom/WeakNodeMap.h',
             'dom/XMLDocument.cpp',
             'dom/XMLDocument.h',
             'dom/custom/CustomElement.cpp',
             'dom/custom/CustomElement.h',
             'dom/custom/CustomElementAsyncImportMicrotaskQueue.cpp',
             'dom/custom/CustomElementAsyncImportMicrotaskQueue.h',
             'dom/custom/CustomElementCallbackInvocation.cpp',
             'dom/custom/CustomElementCallbackInvocation.h',
             'dom/custom/CustomElementCallbackQueue.cpp',
             'dom/custom/CustomElementCallbackQueue.h',
@@ skipping 1468 matching lines @@
             'paint/LayerClipRecorderTest.cpp',
             'paint/LayoutObjectDrawingRecorderTest.cpp',
             'paint/TextPainterTest.cpp',
             'streams/ReadableStreamReaderTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }