Bug 757977 - Don't use uint32 in nsCycleCollector::ScanWeakMaps; r=bsmedberg

xpcom/base/nsCycleCollector.cpp

@@ -2134,8 +2134,8 @@ nsCycleCollector::ScanWeakMaps()
             WeakMapping *wm = &mGraph.mWeakMaps[i];
 
             // If mMap or mKey are null, the original object was marked black.
-            uint32 mColor = wm->mMap ? wm->mMap->mColor : black;
-            uint32 kColor = wm->mKey ? wm->mKey->mColor : black;
+            uint32_t mColor = wm->mMap ? wm->mMap->mColor : black;
+            uint32_t kColor = wm->mKey ? wm->mKey->mColor : black;
             PtrInfo *v = wm->mVal;
 
             // All non-null weak mapping maps, keys and values are