Use std::unique_ptr<> to pass frame ownership in DesktopCapturer impls.

webrtc/modules/desktop_capture/desktop_frame_win.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 12 matching lines @@
                                  HBITMAP bitmap)
     : DesktopFrame(size, stride, data, shared_memory.get()),
       bitmap_(bitmap),
       owned_shared_memory_(std::move(shared_memory)) {}
 
 DesktopFrameWin::~DesktopFrameWin() {
   DeleteObject(bitmap_);
 }
 
 // static
-DesktopFrameWin* DesktopFrameWin::Create(
+std::unique_ptr<DesktopFrameWin> DesktopFrameWin::Create(
     DesktopSize size,
     SharedMemoryFactory* shared_memory_factory,
     HDC hdc) {
   int bytes_per_row = size.width() * kBytesPerPixel;
   int buffer_size = bytes_per_row * size.height();
 
   // Describe a device independent bitmap (DIB) that is the size of the desktop.
   BITMAPINFO bmi = {};
   bmi.bmiHeader.biHeight = -size.height();
   bmi.bmiHeader.biWidth = size.width();
   bmi.bmiHeader.biPlanes = 1;
   bmi.bmiHeader.biBitCount = DesktopFrameWin::kBytesPerPixel * 8;
   bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader);
   bmi.bmiHeader.biSizeImage = bytes_per_row * size.height();
 
   std::unique_ptr<SharedMemory> shared_memory;
   HANDLE section_handle = nullptr;
   if (shared_memory_factory) {
     shared_memory = shared_memory_factory->CreateSharedMemory(buffer_size);
     section_handle = shared_memory->handle();
   }
   void* data = nullptr;
   HBITMAP bitmap = CreateDIBSection(hdc, &bmi, DIB_RGB_COLORS, &data,
                                     section_handle, 0);
   if (!bitmap) {
     LOG(LS_WARNING) << "Failed to allocate new window frame " << GetLastError();
     return nullptr;
   }
 
-  return new DesktopFrameWin(size, bytes_per_row,
-                             reinterpret_cast<uint8_t*>(data),
-                             std::move(shared_memory), bitmap);
+  return std::unique_ptr<DesktopFrameWin>(
+      new DesktopFrameWin(size, bytes_per_row, reinterpret_cast<uint8_t*>(data),
+                          std::move(shared_memory), bitmap));
 }
 
 }  // namespace webrtc