Remove deprecated ExecutionContextTask

third_party/WebKit/Source/core/dom/ExecutionContext.h

Index: third_party/WebKit/Source/core/dom/ExecutionContext.h
diff --git a/third_party/WebKit/Source/core/dom/ExecutionContext.h b/third_party/WebKit/Source/core/dom/ExecutionContext.h
index 2cd6b6b8c08a6eaadf76eaae06dd1a6546ffde55..ba67b54d3e64911d6bbe29cf14276d92be166fd9 100644
--- a/third_party/WebKit/Source/core/dom/ExecutionContext.h
+++ b/third_party/WebKit/Source/core/dom/ExecutionContext.h
@@ -49,7 +49,6 @@ class DOMTimerCoordinator;
 class ErrorEvent;
 class EventQueue;
 class EventTarget;
-class ExecutionContextTask;
 class LocalDOMWindow;
 class SuspendableObject;
 class PublicURLManager;
@@ -95,12 +94,6 @@ class CORE_EXPORT ExecutionContext : public ContextLifecycleNotifier,
   virtual void DisableEval(const String& error_message) = 0;
   virtual LocalDOMWindow* ExecutingWindow() const { return nullptr; }
   virtual String UserAgent() const = 0;
-  // Executes the task on context's thread asynchronously.
-  virtual void PostTask(
-      TaskType,
-      const WebTraceLocation&,
-      std::unique_ptr<ExecutionContextTask>,
-      const String& task_name_for_instrumentation = g_empty_string) = 0;
 
   // Gets the DOMTimerCoordinator which maintains the "active timer
   // list" of tasks created by setTimeout and setInterval. The