Remove now-unnecessary VectorTraits specializations.

Source/core/rendering/RenderGrid.cpp

 /*
  * Copyright (C) 2011 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 15 matching lines @@
 #include "config.h"
 #include "core/rendering/RenderGrid.h"
 
 #include "core/paint/GridPainter.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderView.h"
 #include "core/rendering/TextAutosizer.h"
 #include "core/rendering/style/GridCoordinate.h"
 #include "core/rendering/style/RenderStyle.h"
 #include "platform/LengthFunctions.h"
-#include "wtf/VectorTraits.h"
 
 namespace blink {
 
 static const int infinity = -1;
 
 class GridTrack {
 public:
     GridTrack()
         : m_usedBreadth(0)
         , m_maxBreadth(0)
@@ skipping 642 matching lines @@
     {
         visitor->trace(m_gridItem);
     }
 
 private:
     RawPtrWillBeMember<RenderBox> m_gridItem;
     GridCoordinate m_coordinate;
     size_t m_span;
 };
 
-} // namespace blink
-
-namespace WTF  {
-
-template<>
-struct VectorTraits<blink::GridItemWithSpan> : SimpleClassVectorTraits<blink::GridItemWithSpan> {
-    // needsDestruction is by default defined in terms of IsPod<>, but as
-    // it doesn't handle embedded structs/enums (e.g., GridCoordinate),
-    // override it here.
-    static const bool needsDestruction = false;
-};
-
-} // namespace WTF
-
-namespace blink {
-
 void RenderGrid::resolveContentBasedTrackSizingFunctions(GridTrackSizingDirection direction, GridSizingData& sizingData, LayoutUnit& availableLogicalSpace)
 {
     sizingData.itemsSortedByIncreasingSpan.shrink(0);
     HashSet<RenderBox*> itemsSet;
     size_t contentSizedTracksCount = sizingData.contentSizedTracksIndex.size();
     for (size_t i = 0; i < contentSizedTracksCount; ++i) {
         GridIterator iterator(m_grid, direction, sizingData.contentSizedTracksIndex[i]);
         while (RenderBox* gridItem = iterator.nextGridItem()) {
             if (itemsSet.add(gridItem).isNewEntry)
                 sizingData.itemsSortedByIncreasingSpan.append(GridItemWithSpan(*gridItem, cachedGridCoordinate(*gridItem), direction));
@@ skipping 693 matching lines @@
     if (isOutOfFlowPositioned())
         return "RenderGrid (positioned)";
     if (isAnonymous())
         return "RenderGrid (generated)";
     if (isRelPositioned())
         return "RenderGrid (relative positioned)";
     return "RenderGrid";
 }
 
 } // namespace blink