Cleanup shared memory handling in DesktopCapturer interface.

webrtc/modules/desktop_capture/screen_capturer_mac_unittest.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 62 matching lines @@
   EXPECT_EQ(static_cast<int>(sizeof(uint32_t) * width),
             abs(frame->stride()));
 }
 
 TEST_F(ScreenCapturerMacTest, Capture) {
   EXPECT_CALL(callback_, OnCaptureCompleted(_))
       .Times(2)
       .WillOnce(Invoke(this, &ScreenCapturerMacTest::CaptureDoneCallback1))
       .WillOnce(Invoke(this, &ScreenCapturerMacTest::CaptureDoneCallback2));
 
-  EXPECT_CALL(callback_, CreateSharedMemory(_))
-      .Times(AnyNumber())
-      .WillRepeatedly(Return(static_cast<SharedMemory*>(NULL)));
-
   SCOPED_TRACE("");
   capturer_->Start(&callback_);
 
   // Check that we get an initial full-screen updated.
   capturer_->Capture(DesktopRegion());
 
   // Check that subsequent dirty rects are propagated correctly.
   capturer_->Capture(DesktopRegion());
 }
 
 }  // namespace webrtc