clean up a couple warnings

xpcom/base/CycleCollectedJSRuntime.cpp

@@ -1239,7 +1239,9 @@ IncrementalFinalizeRunnable::Run()
     }
   }
 
+#if(0)
   uint32_t duration = (uint32_t)((TimeStamp::Now() - start).ToMilliseconds());
+#endif
 
   return NS_OK;
 }

xpcom/base/nsCycleCollector.cpp

@@ -3502,6 +3502,7 @@ nsCycleCollector::CleanupAfterCollection()
   mGraph.Clear();
   timeLog.Checkpoint("CleanupAfterCollection::mGraph.Clear()");
 
+#if(0)
   uint32_t interval =
     (uint32_t)((TimeStamp::Now() - mCollectionStart).ToMilliseconds());
 #ifdef COLLECT_TIME_DEBUG
@@ -3516,6 +3517,7 @@ nsCycleCollector::CleanupAfterCollection()
     printf(" (%d%%)", 100 * numFreed / numVisited);
   }
   printf(".\ncc: \n");
+#endif
 #endif
 
   if (mJSRuntime) {