Clean up PlatformThread.

webrtc/test/fake_audio_device.h

Index: webrtc/test/fake_audio_device.h
diff --git a/webrtc/test/fake_audio_device.h b/webrtc/test/fake_audio_device.h
index 9733da36bb28f00249fdfcdc0ee1ddab24b7bae0..7ca657bbb688396a0e0f03856a8234f527e473ef 100644
--- a/webrtc/test/fake_audio_device.h
+++ b/webrtc/test/fake_audio_device.h
@@ -13,6 +13,7 @@
 #include <string>
 
 #include "webrtc/base/criticalsection.h"
+#include "webrtc/base/platform_thread.h"
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/modules/audio_device/include/fake_audio_device.h"
 #include "webrtc/typedefs.h"
@@ -23,7 +24,6 @@ class Clock;
 class EventTimerWrapper;
 class FileWrapper;
 class ModuleFileUtility;
-class PlatformThread;
 
 namespace test {
 
@@ -59,7 +59,7 @@ class FakeAudioDevice : public FakeAudioDeviceModule {
   Clock* clock_;
   rtc::scoped_ptr<EventTimerWrapper> tick_;
   mutable rtc::CriticalSection lock_;
-  rtc::scoped_ptr<PlatformThread> thread_;
+  rtc::PlatformThread thread_;
   rtc::scoped_ptr<ModuleFileUtility> file_utility_;
   rtc::scoped_ptr<FileWrapper> input_stream_;
 };