HTML Imports: Get rid of needsProcessOrStop() from dom/custom/

Source/core/core.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',
             'animation/AnimationSource.idl',
             'animation/AnimationTimeline.idl',
             'animation/Timing.idl',
@@ skipping 2124 matching lines @@
             'dom/VisitedLinkState.cpp',
             'dom/VisitedLinkState.h',
             'dom/WeakNodeMap.cpp',
             'dom/WeakNodeMap.h',
             'dom/WheelController.cpp',
             'dom/WheelController.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/CustomElementCallbackDispatcher.cpp',
             'dom/custom/CustomElementCallbackDispatcher.h',
             'dom/custom/CustomElementCallbackInvocation.cpp',
             'dom/custom/CustomElementCallbackInvocation.h',
             'dom/custom/CustomElementCallbackQueue.cpp',
             'dom/custom/CustomElementCallbackQueue.h',
             'dom/custom/CustomElementDefinition.cpp',
             'dom/custom/CustomElementDefinition.h',
             'dom/custom/CustomElementDescriptor.h',
             'dom/custom/CustomElementDescriptorHash.h',
@@ skipping 1235 matching lines @@
             'loader/MixedContentCheckerTest.cpp',
             'page/NetworkStateNotifierTest.cpp',
             'rendering/RenderOverflowTest.cpp',
             'rendering/shapes/BoxShapeTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }