Migrate WTF::Vector::append() to ::push_back() [part 1 of N]

third_party/WebKit/Source/bindings/core/v8/DOMWrapperWorld.cpp

Index: third_party/WebKit/Source/bindings/core/v8/DOMWrapperWorld.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/DOMWrapperWorld.cpp b/third_party/WebKit/Source/bindings/core/v8/DOMWrapperWorld.cpp
index 7515ae8f411748b209c1b3422fdec7e1864d32d9..b8ebbbf4bb29e6e3334d47a0822b0ee7679a68fa 100644
--- a/third_party/WebKit/Source/bindings/core/v8/DOMWrapperWorld.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/DOMWrapperWorld.cpp
@@ -140,11 +140,11 @@ static WorldMap& isolatedWorldMap() {
 void DOMWrapperWorld::allWorldsInMainThread(
     Vector<RefPtr<DOMWrapperWorld>>& worlds) {
   ASSERT(isMainThread());
-  worlds.append(&mainWorld());
+  worlds.push_back(&mainWorld());
   WorldMap& isolatedWorlds = isolatedWorldMap();
   for (WorldMap::iterator it = isolatedWorlds.begin();
        it != isolatedWorlds.end(); ++it)
-    worlds.append(it->value);
+    worlds.push_back(it->value);
 }
 
 void DOMWrapperWorld::markWrappersInAllWorlds(