Cleanup shared memory handling in DesktopCapturer interface.

webrtc/modules/desktop_capture/desktop_and_cursor_composer.cc

Index: webrtc/modules/desktop_capture/desktop_and_cursor_composer.cc
diff --git a/webrtc/modules/desktop_capture/desktop_and_cursor_composer.cc b/webrtc/modules/desktop_capture/desktop_and_cursor_composer.cc
index 74d25d4e1fac99e3d75e93bad0f17e4727a3263f..5da8beebb6e9936b086918355e6ee51345817814 100644
--- a/webrtc/modules/desktop_capture/desktop_and_cursor_composer.cc
+++ b/webrtc/modules/desktop_capture/desktop_and_cursor_composer.cc
@@ -136,6 +136,11 @@ void DesktopAndCursorComposer::Start(DesktopCapturer::Callback* callback) {
   desktop_capturer_->Start(this);
 }
 
+void DesktopAndCursorComposer::SetSharedMemoryFactory(
+    rtc::scoped_ptr<SharedMemoryFactory> shared_memory_factory) {
+  desktop_capturer_->SetSharedMemoryFactory(std::move(shared_memory_factory));
+}
+
 void DesktopAndCursorComposer::Capture(const DesktopRegion& region) {
   if (mouse_monitor_.get())
     mouse_monitor_->Capture();
@@ -146,10 +151,6 @@ void DesktopAndCursorComposer::SetExcludedWindow(WindowId window) {
   desktop_capturer_->SetExcludedWindow(window);
 }
 
-SharedMemory* DesktopAndCursorComposer::CreateSharedMemory(size_t size) {
-  return callback_->CreateSharedMemory(size);
-}
-
 void DesktopAndCursorComposer::OnCaptureCompleted(DesktopFrame* frame) {
   if (frame && cursor_.get() && cursor_state_ == MouseCursorMonitor::INSIDE) {
     DesktopFrameWithCursor* frame_with_cursor =