Rewrite references to "wtf/" to "platform/wtf/" in core/layout.

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"
+#include "platform/wtf/Allocator.h"
 
 namespace blink {
 
 // A group of columns, that are laid out in the inline progression direction,
 // all with the same column height.
 //
 // When a multicol container is inside another fragmentation context, and said
 // multicol container lives in multiple outer fragmentainers (pages / columns),
 // we need to put these inner columns into separate groups, with one group per
 // outer fragmentainer. Such a group of columns is what comprises a "row of
@@ skipping 200 matching lines @@
 
  private:
   LayoutMultiColumnSet& column_set_;
 
   Vector<MultiColumnFragmentainerGroup, 1> groups_;
 };
 
 }  // namespace blink
 
 #endif  // MultiColumnFragmentainerGroup_h