Move ThreadWrapper to ProcessThread in base.

webrtc/modules/video_render/ios/video_render_ios_gles20.h

Index: webrtc/modules/video_render/ios/video_render_ios_gles20.h
diff --git a/webrtc/modules/video_render/ios/video_render_ios_gles20.h b/webrtc/modules/video_render/ios/video_render_ios_gles20.h
index b6da12aab8465bace02d7e069807306434fa4990..51a0137f6b60f6aac709baaf11a2e7d9729df29c 100644
--- a/webrtc/modules/video_render/ios/video_render_ios_gles20.h
+++ b/webrtc/modules/video_render/ios/video_render_ios_gles20.h
@@ -14,10 +14,10 @@
 #include <list>
 #include <map>
 
+#include "webrtc/base/platform_thread.h"
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/modules/video_render/ios/video_render_ios_channel.h"
 #include "webrtc/modules/video_render/ios/video_render_ios_view.h"
-#include "webrtc/system_wrappers/include/thread_wrapper.h"
 
 namespace webrtc {
 
@@ -64,7 +64,7 @@ class VideoRenderIosGles20 {
  private:
   rtc::scoped_ptr<CriticalSectionWrapper> gles_crit_sec_;
   EventTimerWrapper* screen_update_event_;
-  rtc::scoped_ptr<ThreadWrapper> screen_update_thread_;
+  rtc::scoped_ptr<PlatformThread> screen_update_thread_;
 
   VideoRenderIosView* view_;
   Rect window_rect_;