Bug 538918 - Move Init() above mutex unlock - attempted test hang fix.

ipc/glue/WindowsMessageLoop.cpp

@@ -604,11 +604,11 @@ SyncChannel::WaitForNotify()
 {
   mMutex.AssertCurrentThreadOwns();
 
-  MutexAutoUnlock unlock(mMutex);
-
   // Initialize global objects used in deferred messaging.
   Init();
 
+  MutexAutoUnlock unlock(mMutex);
+
   if (++gEventLoopDepth == 1) {
     NS_ASSERTION(!gNeuteredWindows, "Should only set this once!");
     gNeuteredWindows = new nsAutoTArray<HWND, 20>();
@@ -712,11 +712,11 @@ RPCChannel::WaitForNotify()
 {
   mMutex.AssertCurrentThreadOwns();
 
-  MutexAutoUnlock unlock(mMutex);
-
   // Initialize global objects used in deferred messaging.
   Init();
 
+  MutexAutoUnlock unlock(mMutex);
+
   // IsSpinLoopActive indicates modal UI is being displayed in a plugin. Drop
   // down into the spin loop until all modal loops end. If SpinInternalEventLoop
   // returns true, the out-call response we were waiting on arrived, or we