Migrate WTF::LinkedHashSet/ListHashSet::first() to ::front()

third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.cpp

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 446 matching lines @@
           columnSet->previousSiblingMultiColumnSet();
       if (!previousSet)
         break;
       columnSet = previousSet;
     }
   } else {
     DCHECK(!m_columnSetsInvalidated);
     if (m_multiColumnSetList.isEmpty())
       return nullptr;
     if (offset < LayoutUnit()) {
-      columnSet = m_multiColumnSetList.first();
+      columnSet = m_multiColumnSetList.front();
     } else {
       MultiColumnSetSearchAdapter adapter(offset);
       m_multiColumnSetIntervalTree
           .allOverlapsWithAdapter<MultiColumnSetSearchAdapter>(adapter);
 
       // If no set was found, the offset is in the flow thread overflow.
       if (!adapter.result() && !m_multiColumnSetList.isEmpty())
         columnSet = m_multiColumnSetList.last();
       else
         columnSet = adapter.result();
@@ skipping 891 matching lines @@
     const {
   return MultiColumnLayoutState(m_lastSetWorkedOn);
 }
 
 void LayoutMultiColumnFlowThread::restoreMultiColumnLayoutState(
     const MultiColumnLayoutState& state) {
   m_lastSetWorkedOn = state.columnSet();
 }
 
 }  // namespace blink