Remove unused TileGridInfo

Chromium no longer uses TileGridInfo as of CL 856853003 and remove this
from skia.

BUG=chromium:447662

Review URL: https://codereview.chromium.org/828503004

include/core/SkBBHFactory.h

@@ -8,7 +8,6 @@
 #ifndef SkBBHFactory_DEFINED
 #define SkBBHFactory_DEFINED
 
-#include "SkSize.h"
 #include "SkRect.h"
 
 class SkBBoxHierarchy;
@@ -29,25 +28,4 @@ private:
     typedef SkBBHFactory INHERITED;
 };
 
-// TODO(mtklein): delete entirely when Chromium's clean for TileGridInfo
-class SK_API SkTileGridFactory {
-public:
-    struct TileGridInfo {
-        /** Tile placement interval */
-        SkISize  fTileInterval;
-
-        /** Pixel coverage overlap between adjacent tiles */
-        SkISize  fMargin;
-
-        /** Offset added to device-space bounding box positions to convert
-          * them to tile-grid space. This can be used to adjust the "phase"
-          * of the tile grid to match probable query rectangles that will be
-          * used to search into the tile grid. As long as the offset is smaller
-          * or equal to the margin, there is no need to extend the domain of
-          * the tile grid to prevent data loss.
-          */
-        SkIPoint fOffset;
-    };
-};
-
 #endif