Remove V8RecrusionScope, cleanup call sites.

third_party/WebKit/Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 2451 matching lines @@
             'dom/LayoutTreeBuilderTraversal.h',
             'dom/LiveNodeList.cpp',
             'dom/LiveNodeList.h',
             'dom/LiveNodeListBase.cpp',
             'dom/LiveNodeListBase.h',
             'dom/MainThreadTaskRunner.cpp',
             'dom/MainThreadTaskRunner.h',
             'dom/MessageChannel.cpp',
             'dom/MessageChannel.h',
             'dom/MessagePort.cpp',
-            'dom/Microtask.cpp',
-            'dom/Microtask.h',
             'dom/MutationCallback.h',
             'dom/MutationObserver.cpp',
             'dom/MutationObserver.h',
             'dom/MutationObserverInterestGroup.cpp',
             'dom/MutationObserverInterestGroup.h',
             'dom/MutationObserverRegistration.cpp',
             'dom/MutationObserverRegistration.h',
             'dom/MutationRecord.cpp',
             'dom/MutationRecord.h',
             'dom/NameNodeList.cpp',
@@ skipping 1578 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }