Revert of "Create rtc::AtomicInt POD struct."

webrtc/modules/pacing/packet_router.h

Index: webrtc/modules/pacing/packet_router.h
diff --git a/webrtc/modules/pacing/packet_router.h b/webrtc/modules/pacing/packet_router.h
index 50913b5df20d932dde661255021faa217500aef0..edef1aa9b3f89618b6c33625487225aebac26c88 100644
--- a/webrtc/modules/pacing/packet_router.h
+++ b/webrtc/modules/pacing/packet_router.h
@@ -13,7 +13,6 @@
 
 #include <list>
 
-#include "webrtc/base/atomicops.h"
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/base/scoped_ptr.h"
@@ -59,7 +58,7 @@
   // Map from ssrc to sending rtp module.
   std::list<RtpRtcp*> rtp_modules_ GUARDED_BY(modules_lock_);
 
-  rtc::AtomicInt transport_seq_;
+  volatile int transport_seq_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(PacketRouter);
 };