Migrate WTF::Vector::append() to ::push_back() [part 12 of N]

third_party/WebKit/Source/core/loader/FrameLoader.cpp

Index: third_party/WebKit/Source/core/loader/FrameLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameLoader.cpp b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
index dafe916b9563d86da938dbe4cea8e5ddcac4a5ee..aa2836e14ac36870b5874b7c3069b564b3ef1d9d 100644
--- a/third_party/WebKit/Source/core/loader/FrameLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
@@ -1549,13 +1549,13 @@ bool FrameLoader::shouldClose(bool isReload) {
   // Store all references to each subframe in advance since beforeunload's event
   // handler may modify frame
   HeapVector<Member<LocalFrame>> targetFrames;
-  targetFrames.append(m_frame);
+  targetFrames.push_back(m_frame);
   for (Frame* child = m_frame->tree().firstChild(); child;
        child = child->tree().traverseNext(m_frame)) {
     // FIXME: There is not yet any way to dispatch events to out-of-process
     // frames.
     if (child->isLocalFrame())
-      targetFrames.append(toLocalFrame(child));
+      targetFrames.push_back(toLocalFrame(child));
   }
 
   bool shouldClose = false;