Revert of Pass per-frame task runners to Workers (when possible)

third_party/WebKit/Source/core/workers/InProcessWorkerMessagingProxy.h

Index: third_party/WebKit/Source/core/workers/InProcessWorkerMessagingProxy.h
diff --git a/third_party/WebKit/Source/core/workers/InProcessWorkerMessagingProxy.h b/third_party/WebKit/Source/core/workers/InProcessWorkerMessagingProxy.h
index 2e7adddff7ecc5509c3463d048647d0b244c453f..882ae2c897f21034e1d778fc10a1d3eb422bbb3f 100644
--- a/third_party/WebKit/Source/core/workers/InProcessWorkerMessagingProxy.h
+++ b/third_party/WebKit/Source/core/workers/InProcessWorkerMessagingProxy.h
@@ -41,13 +41,12 @@
 
 namespace blink {
 
+class InProcessWorkerObjectProxy;
+class WorkerThread;
 class ExecutionContext;
 class InProcessWorkerBase;
-class InProcessWorkerObjectProxy;
-class ParentFrameTaskRunners;
 class WorkerClients;
 class WorkerInspectorProxy;
-class WorkerThread;
 
 // TODO(nhiroki): "MessagingProxy" is not well-defined term among worker
 // components. Probably we should rename this to something more suitable.
@@ -78,8 +77,6 @@ public:
 
     ExecutionContext* getExecutionContext() const { return m_executionContext.get(); }
 
-    ParentFrameTaskRunners* getParentFrameTaskRunners() { return m_parentFrameTaskRunners.get(); }
-
     // Number of live messaging proxies, used by leak detection.
     static int proxyCount();
 
@@ -127,8 +124,6 @@ private:
 
     Persistent<WorkerClients> m_workerClients;
 
-    std::unique_ptr<ParentFrameTaskRunners> m_parentFrameTaskRunners;
-
     RefPtr<WorkerLoaderProxy> m_loaderProxy;
 };