cc: Spiral iterator fix for negative center.

cc/base/tiling_data.h

Index: cc/base/tiling_data.h
diff --git a/cc/base/tiling_data.h b/cc/base/tiling_data.h
index 17274af142fd8a1001af3dfdfbfe21dd6c057daf..70c465c1530cce2d5da9872dd530db17e1e0d3c3 100644
--- a/cc/base/tiling_data.h
+++ b/cc/base/tiling_data.h
@@ -179,11 +179,6 @@ class CC_EXPORT TilingData {
   };
 
  private:
-  std::pair<int, int> UnclampedFirstBorderTileIndexFromSrcCoord(int x,
-                                                                int y) const;
-  std::pair<int, int> UnclampedLastBorderTileIndexFromSrcCoord(int x,
-                                                               int y) const;
-
   void AssertTile(int i, int j) const {
     DCHECK_GE(i,  0);
     DCHECK_LT(i, num_tiles_x_);