The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/84f5959aa09e9841e5aea9993247b46b42a60d9a

commit 84f5959aa09e9841e5aea9993247b46b42a60d9a
Author: yuryu <yuryu@chromium.org>
Date: Thu Aug 25 11:07:04 2016

Move createCrossThreadTask to ExecutionContextTask.h

Move createCrossThreadTask to ExecutionContextTask.h so that
both same thread and cross thread versions of createTask are in the
same header file.
Currently createCrossThreadTask is in CrossThreadTask.h,
but the implementation is a few lines of code, so merging it to
ExecutionContextTask.h and removing CrossThreadTask.h.

BUG= 638839 

Review-Url: https://codereview.chromium.org/2264543002
Cr-Commit-Position: refs/heads/master@{#414390}

[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/core.gypi
[delete] https://crrev.com/efc343f3e590013c880525c0d934f1322dc5438d/third_party/WebKit/Source/core/dom/CrossThreadTask.h
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/dom/Document.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/dom/ExecutionContextTask.h
[rename] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/dom/ExecutionContextTaskTest.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/dom/MessagePort.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/fileapi/FileReader.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/loader/ThreadableLoaderTest.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/loader/WorkerThreadableLoader.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/page/NetworkStateNotifier.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/workers/DedicatedWorkerGlobalScope.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/workers/DedicatedWorkerTest.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/workers/InProcessWorkerMessagingProxy.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/workers/InProcessWorkerObjectProxy.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/workers/WorkerGlobalScope.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/core/workers/WorkerInspectorProxy.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/modules/fetch/CrossThreadHolder.h
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/modules/mediastream/MediaStreamTrackSourcesRequestImpl.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/modules/webaudio/AudioScheduledSourceNode.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/modules/webaudio/OfflineAudioDestinationNode.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/modules/webaudio/ScriptProcessorNode.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/modules/webdatabase/Database.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/modules/webdatabase/DatabaseTracker.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/modules/webdatabase/SQLTransactionClient.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/modules/websockets/WorkerWebSocketChannel.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/web/ServiceWorkerGlobalScopeProxy.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
[modify] https://crrev.com/84f5959aa09e9841e5aea9993247b46b42a60d9a/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp