Pass Callback to TaskRunner by value and consume it on invocation (1)

third_party/WebKit/Source/platform/WebTaskRunner.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebTaskRunner_h
 #define WebTaskRunner_h
 
-#include "base/callback_forward.h"
+#include <memory>
+#include "base/callback.h"
 #include "public/platform/WebCommon.h"
 #include "public/platform/WebTraceLocation.h"
 #include "wtf/Compiler.h"
 #include "wtf/Functional.h"
 #include "wtf/RefCounted.h"
 #include "wtf/WeakPtr.h"
-#include <memory>
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace blink {
 
 using SingleThreadTaskRunner = base::SingleThreadTaskRunner;
 
 // TaskHandle is associated to a task posted by
@@ skipping 29 matching lines @@
   RefPtr<Runner> m_runner;
 };
 
 // The blink representation of a chromium SingleThreadTaskRunner.
 class BLINK_PLATFORM_EXPORT WebTaskRunner
     : public ThreadSafeRefCounted<WebTaskRunner> {
  public:
   // Schedule a task to be run after |delayMs| on the the associated WebThread.
   // Can be called from any thread.
   virtual void postDelayedTask(const WebTraceLocation&,
-                               const base::Closure&,
+                               base::Closure,
                                double delayMs) = 0;
 
   // Returns true if the current thread is a thread on which a task may be run.
   // Can be called from any thread.
   virtual bool runsTasksOnCurrentThread() = 0;
 
   // ---
 
   // Headless Chrome virtualises time for determinism and performance (fast
   // forwarding of timers). To make this work some parts of blink (e.g. Timers)
@@ skipping 43 matching lines @@
   WebTaskRunner() = default;
   virtual ~WebTaskRunner();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebTaskRunner);
 };
 
 }  // namespace blink
 
 #endif  // WebTaskRunner_h