Remove SkQuadTree.

dm/DMQuiltTask.h

 #ifndef DMQuiltTask_DEFINED
 #define DMQuiltTask_DEFINED
 
 #include "DMTask.h"
 #include "SkBitmap.h"
 #include "SkString.h"
 #include "SkTemplates.h"
 #include "gm.h"
 
 // Records a GM through an SkPicture, draws it in tiles, and compares against the reference bitmap.
 
 namespace DM {
 
 class QuiltTask : public CpuTask {
 public:
     enum BBH {
         kNone_BBH,
         kRTree_BBH,
-        kQuadTree_BBH,
         kTileGrid_BBH,
     };
     enum Backend {
         kDefault_Backend,
         kSkRecord_Backend,
     };
 
     QuiltTask(const Task& parent,  // QuiltTask must be a child task.  Pass its parent here.
               skiagm::GM*,         // GM to run through a picture.  Takes ownership.
               SkBitmap reference,  // Bitmap to compare picture replay results to.
               BBH, Backend);
 
     virtual void draw() SK_OVERRIDE;
     virtual bool shouldSkip() const SK_OVERRIDE;
     virtual SkString name() const SK_OVERRIDE { return fName; }
 
 private:
     const BBH fBBH;
     const Backend fBackend;
     const SkString fName;
     SkAutoTDelete<skiagm::GM> fGM;
     const SkBitmap fReference;
 };
 
 }  // namespace DM
 
 #endif  // DMReplayTask_DEFINED