Replace the remaining scoped_ptr with unique_ptr in webrtc/modules/

(This is a re-land of https://codereview.webrtc.org/1921233002, which
got reverted for breaking Chromium.)

BUG=webrtc:5520

Review URL: https://codereview.webrtc.org/1923133002

Cr-Commit-Position: refs/heads/master@{#12522}

webrtc/modules/desktop_capture/shared_memory.h

diff --git a/webrtc/modules/desktop_capture/shared_memory.h b/webrtc/modules/desktop_capture/shared_memory.h
index 45f531e..e1d1e7c 100644
--- a/webrtc/modules/desktop_capture/shared_memory.h
+++ b/webrtc/modules/desktop_capture/shared_memory.h
@@ -17,6 +17,8 @@
 #include <windows.h>
 #endif
 
+#include <memory>
+
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/typedefs.h"
@@ -69,7 +71,7 @@
   SharedMemoryFactory() {}
   virtual ~SharedMemoryFactory() {}
 
-  virtual rtc::scoped_ptr<SharedMemory> CreateSharedMemory(size_t size) = 0;
+  virtual std::unique_ptr<SharedMemory> CreateSharedMemory(size_t size) = 0;
 
  private:
   RTC_DISALLOW_COPY_AND_ASSIGN(SharedMemoryFactory);