Bug 573530: Remove unused variable in nsXPComInit.cpp. r=bsmedberg

xpcom/build/nsXPComInit.cpp

@@ -697,8 +697,8 @@ NS_InitXPCOM3(nsIServiceManager* *result,
     NS_TIME_FUNCTION_MARK("Next: interface info manager init");
 
     // The iimanager constructor searches and registers XPT files.
-    nsIInterfaceInfoManager* iim =
-        xptiInterfaceInfoManager::GetSingleton();
+    // (We trigger the singleton's lazy construction here to make that happen.)
+    (void) xptiInterfaceInfoManager::GetSingleton();
 
     NS_TIME_FUNCTION_MARK("Next: try to load compreg.dat");