Undo my previous change, which was wrong. PR_TRUE is the correct way to continue enumeration for |nsHashtable|s. I don't know what is causing the leak (bug 43707). r=hyatt

content/xbl/src/nsXBLService.cpp

@@ -180,7 +180,7 @@ static PRBool PR_CALLBACK DeleteClasses(nsHashKey* aKey, void* aValue, void* clo
   JSClass* c = (JSClass*)aValue;
   nsMemory::Free(c->name);
   delete c;
-  return HT_ENUMERATE_NEXT;
+  return PR_TRUE; // return PR_TRUE to continue for nsHashtable enumerator
 }
 
 nsXBLService::~nsXBLService(void)

layout/xbl/src/nsXBLService.cpp

@@ -180,7 +180,7 @@ static PRBool PR_CALLBACK DeleteClasses(nsHashKey* aKey, void* aValue, void* clo
   JSClass* c = (JSClass*)aValue;
   nsMemory::Free(c->name);
   delete c;
-  return HT_ENUMERATE_NEXT;
+  return PR_TRUE; // return PR_TRUE to continue for nsHashtable enumerator
 }
 
 nsXBLService::~nsXBLService(void)