Oilpan: move RenderObjects off heap.

Source/core/rendering/RenderGrid.cpp

Index: Source/core/rendering/RenderGrid.cpp
diff --git a/Source/core/rendering/RenderGrid.cpp b/Source/core/rendering/RenderGrid.cpp
index 6a55e68cb75600676d80e5b4385a0b3ce4e19dd3..f2295bdf7d0b1f7c9b1c6c55824a1ee74a5236dc 100644
--- a/Source/core/rendering/RenderGrid.cpp
+++ b/Source/core/rendering/RenderGrid.cpp
@@ -248,7 +248,7 @@ public:
 
     // Performance optimization: hold onto these Vectors until the end of Layout to avoid repeated malloc / free.
     Vector<GridTrack*> filteredTracks;
-    WillBeHeapVector<GridItemWithSpan> itemsSortedByIncreasingSpan;
+    Vector<GridItemWithSpan> itemsSortedByIncreasingSpan;
     Vector<GridTrack*> growBeyondGrowthLimitsTracks;
 };
 
@@ -669,7 +669,7 @@ class GridItemWithSpan {
     ALLOW_ONLY_INLINE_ALLOCATION();

[haraken, 2015/02/04 05:48:56]

You can drop ALLOW_ONLY_INLINE_ALLOCATION().

[sof, 2015/02/04 08:44:31]

Done.

 public:
     GridItemWithSpan(RenderBox& gridItem, const GridCoordinate& coordinate, GridTrackSizingDirection direction)
-        : m_gridItem(gridItem)
+        : m_gridItem(&gridItem)
         , m_coordinate(coordinate)
     {
         const GridSpan& span = (direction == ForRows) ? coordinate.rows : coordinate.columns;
@@ -684,13 +684,8 @@ public:
 
     bool operator<(const GridItemWithSpan other) const { return m_span < other.m_span; }
 
-    void trace(Visitor* visitor)
-    {
-        visitor->trace(m_gridItem);
-    }
-
 private:
-    RawPtrWillBeMember<RenderBox> m_gridItem;
+    RenderBox* m_gridItem;
     GridCoordinate m_coordinate;
     size_t m_span;
 };