Cleanup shared memory handling in DesktopCapturer interface.

webrtc/modules/desktop_capture/screen_capturer_mac_unittest.cc

Index: webrtc/modules/desktop_capture/screen_capturer_mac_unittest.cc
diff --git a/webrtc/modules/desktop_capture/screen_capturer_mac_unittest.cc b/webrtc/modules/desktop_capture/screen_capturer_mac_unittest.cc
index e3d037b1e96a9bc3b2623a4b61bd789a573f15f9..737d5391b2c88fb0612fe26df815d5a7ea20d113 100644
--- a/webrtc/modules/desktop_capture/screen_capturer_mac_unittest.cc
+++ b/webrtc/modules/desktop_capture/screen_capturer_mac_unittest.cc
@@ -80,10 +80,6 @@ TEST_F(ScreenCapturerMacTest, Capture) {
       .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_);