Bug 518904: remove unused variable in nsLayoutDebugCLH.cpp to fix build warning. r=dbaron

extensions/layout-debug/src/nsLayoutDebugCLH.cpp

@@ -62,7 +62,6 @@ NS_IMETHODIMP
 nsLayoutDebugCLH::Handle(nsICommandLine* aCmdLine)
 {
     nsresult rv;
-    PRBool found;
 
     PRInt32 idx;
     rv = aCmdLine->FindFlag(NS_LITERAL_STRING("layoutdebug"), PR_FALSE, &idx);