Add RTC_ prefix to contructormagic macros.

We must remove dependency on Chromium, i.e. we can't use Chromium's base/logging.h. That means we need to define these macros in WebRTC also when doing Chromium builds. And this causes redefinition.

* DISALLOW_ASSIGN -> RTC_DISALLOW_ASSIGN
* DISALLOW_COPY_AND_ASSIGN -> RTC_DISALLOW_COPY_AND_ASSIGN
* DISALLOW_IMPLICIT_CONSTRUCTORS -> RTC_DISALLOW_IMPLICIT_CONSTRUCTORS

Related CL: https://codereview.webrtc.org/1335923002/

BUG=chromium:468375
NOTRY=true

Review URL: https://codereview.webrtc.org/1345433002

Cr-Original-Commit-Position: refs/heads/master@{#9953}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 3c089d751ede283e21e186885eaf705c3257ccd2
diff --git a/modules/desktop_capture/desktop_frame_win.h b/modules/desktop_capture/desktop_frame_win.h
index 9530fdc..15b5883 100644
--- a/modules/desktop_capture/desktop_frame_win.h
+++ b/modules/desktop_capture/desktop_frame_win.h
@@ -40,7 +40,7 @@
   HBITMAP bitmap_;
   rtc::scoped_ptr<SharedMemory> owned_shared_memory_;
 
-  DISALLOW_COPY_AND_ASSIGN(DesktopFrameWin);
+  RTC_DISALLOW_COPY_AND_ASSIGN(DesktopFrameWin);
 };
 
 }  // namespace webrtc