Replacing most of web_task.h with base::Closure + base::WeakPtrFactory.

components/test_runner/mock_webrtc_dtmf_sender_handler.h

Index: components/test_runner/mock_webrtc_dtmf_sender_handler.h
diff --git a/components/test_runner/mock_webrtc_dtmf_sender_handler.h b/components/test_runner/mock_webrtc_dtmf_sender_handler.h
index 4e6487a91fb061d0e7e24c36aa4d3cb694403b68..20b2b039e8feb14a4e2ea5b3b74ad5fd29c6713a 100644
--- a/components/test_runner/mock_webrtc_dtmf_sender_handler.h
+++ b/components/test_runner/mock_webrtc_dtmf_sender_handler.h
@@ -6,7 +6,7 @@
 #define COMPONENTS_TEST_RUNNER_MOCK_WEBRTC_DTMF_SENDER_HANDLER_H_
 
 #include "base/macros.h"
-#include "components/test_runner/web_task.h"
+#include "base/memory/weak_ptr.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 #include "third_party/WebKit/public/platform/WebRTCDTMFSenderHandler.h"
 #include "third_party/WebKit/public/platform/WebString.h"
@@ -19,6 +19,7 @@ class MockWebRTCDTMFSenderHandler : public blink::WebRTCDTMFSenderHandler {
  public:
   MockWebRTCDTMFSenderHandler(const blink::WebMediaStreamTrack& track,
                               WebTestDelegate* delegate);
+  ~MockWebRTCDTMFSenderHandler() override;
 
   // WebRTCDTMFSenderHandler related methods
   void setClient(blink::WebRTCDTMFSenderHandlerClient* client) override;
@@ -28,20 +29,18 @@ class MockWebRTCDTMFSenderHandler : public blink::WebRTCDTMFSenderHandler {
                   long duration,
                   long inter_tone_gap) override;
 
-  // WebTask related methods
-  WebTaskList* mutable_task_list() { return &task_list_; }
-
   void ClearToneBuffer() { tone_buffer_.reset(); }
 
  private:
-  MockWebRTCDTMFSenderHandler();
+  void PlayTone();
 
   blink::WebRTCDTMFSenderHandlerClient* client_;
   blink::WebMediaStreamTrack track_;
   blink::WebString tone_buffer_;
-  WebTaskList task_list_;
   WebTestDelegate* delegate_;
 
+  base::WeakPtrFactory<MockWebRTCDTMFSenderHandler> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(MockWebRTCDTMFSenderHandler);
 };