Migrate WTF::Vector::append() to ::push_back() [part 9 of N]

third_party/WebKit/Source/core/layout/MultiColumnFragmentainerGroup.h

 // Copyright 2015 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.
 
 #ifndef MultiColumnFragmentainerGroup_h
 #define MultiColumnFragmentainerGroup_h
 
 #include "core/layout/LayoutMultiColumnFlowThread.h"
 #include "wtf/Allocator.h"
 
@@ skipping 175 matching lines @@
   iterator end() { return m_groups.end(); }
   const_iterator end() const { return m_groups.end(); }
 
   size_t size() const { return m_groups.size(); }
   MultiColumnFragmentainerGroup& operator[](size_t i) { return m_groups.at(i); }
   const MultiColumnFragmentainerGroup& operator[](size_t i) const {
     return m_groups.at(i);
   }
 
   void append(const MultiColumnFragmentainerGroup& group) {
-    m_groups.append(group);
+    m_groups.push_back(group);
   }
   void shrink(size_t size) { m_groups.shrink(size); }
 
  private:
   LayoutMultiColumnSet& m_columnSet;
 
   Vector<MultiColumnFragmentainerGroup, 1> m_groups;
 };
 
 }  // namespace blink
 
 #endif  // MultiColumnFragmentainerGroup_h