Migrate WTF::Vector::append() to ::push_back() [part 6 of N]

third_party/WebKit/Source/core/frame/RemoteFrame.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/frame/RemoteFrame.h"
 
 #include "bindings/core/v8/WindowProxy.h"
 #include "bindings/core/v8/WindowProxyManager.h"
 #include "core/dom/RemoteSecurityContext.h"
 #include "core/frame/LocalFrame.h"
@@ skipping 175 matching lines @@
 void RemoteFrame::advanceFocus(WebFocusType type, LocalFrame* source) {
   client()->advanceFocus(type, source);
 }
 
 void RemoteFrame::detachChildren() {
   using FrameVector = HeapVector<Member<Frame>>;
   FrameVector childrenToDetach;
   childrenToDetach.reserveCapacity(tree().childCount());
   for (Frame* child = tree().firstChild(); child;
        child = child->tree().nextSibling())
-    childrenToDetach.append(child);
+    childrenToDetach.push_back(child);
   for (const auto& child : childrenToDetach)
     child->detach(FrameDetachType::Remove);
 }
 
 }  // namespace blink