Revert of [blink] Unique pointers in Platform.h

content/renderer/media_capture_from_element/canvas_capture_handler.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 CONTENT_RENDERER_MEDIA_CAPTURE_FROM_ELEMENT_CANVAS_CAPTURE_HANDLER_H_
 #define CONTENT_RENDERER_MEDIA_CAPTURE_FROM_ELEMENT_CANVAS_CAPTURE_HANDLER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 24 matching lines @@
 // is owned by a CanvasCaptureMediaStreamTrack.
 // All methods are called on the same thread as construction and destruction,
 // i.e. the Main Render thread. Note that a CanvasCaptureHandlerDelegate is
 // used to send back frames to |io_task_runner_|, i.e. IO thread.
 class CONTENT_EXPORT CanvasCaptureHandler final
     : public NON_EXPORTED_BASE(blink::WebCanvasCaptureHandler) {
  public:
   ~CanvasCaptureHandler() override;
 
   // Creates a CanvasCaptureHandler instance and updates UMA histogram.
-  static std::unique_ptr<CanvasCaptureHandler> CreateCanvasCaptureHandler(
+  static CanvasCaptureHandler* CreateCanvasCaptureHandler(
       const blink::WebSize& size,
       double frame_rate,
       const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
       blink::WebMediaStreamTrack* track);
 
   // blink::WebCanvasCaptureHandler Implementation.
   void SendNewFrame(const SkImage* image) override;
   bool NeedsNewFrame() const override;
 
   // Functions called by media::VideoCapturerSource implementation.
@@ skipping 44 matching lines @@
   // Bound to Main Render thread.
   base::ThreadChecker main_render_thread_checker_;
   base::WeakPtrFactory<CanvasCaptureHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CanvasCaptureHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_CAPTURE_FROM_ELEMENT_CANVAS_CAPTURE_HANDLER_H_