Bug 1402824 - Add missing includes in CooperativeThreadPool to fix non-unified build. r=billm

nsCOMPtr and nsThreadPoolNaming types were used without prior
declaration.

MozReview-Commit-ID: Gt7gksujs13

--HG--
extra : rebase_source : 18c5572548dc181ffe921154d9da00113a5e0090

xpcom/threads/CooperativeThreadPool.h

@@ -10,8 +10,11 @@
 #include "mozilla/Array.h"
 #include "mozilla/CondVar.h"
 #include "mozilla/Mutex.h"
+#include "mozilla/ThreadLocal.h"
 #include "mozilla/UniquePtr.h"
 #include "mozilla/Variant.h"
+#include "nsCOMPtr.h"
+#include "nsThreadUtils.h"
 #include "prthread.h"
 
 // Windows silliness. winbase.h defines an empty no-argument Yield macro.