Remove SkQuadTree.

dm/DMQuiltTask.cpp

Index: dm/DMQuiltTask.cpp
diff --git a/dm/DMQuiltTask.cpp b/dm/DMQuiltTask.cpp
index 469b20f433fe8175d8357a5f6e2a7b00775a83e3..6961f096710e82b97e567544145d99aa243235e6 100644
--- a/dm/DMQuiltTask.cpp
+++ b/dm/DMQuiltTask.cpp
@@ -14,7 +14,7 @@ namespace DM {
 
 static SkString suffix(QuiltTask::Backend backend, QuiltTask::BBH bbh) {
     static const char* kBackends[] = { "default", "skrecord" };
-    static const char* kBBHs[]     = { "nobbh", "rtree", "quadtree", "tilegrid" };
+    static const char* kBBHs[]     = { "nobbh", "rtree", "tilegrid" };
     return SkStringPrintf("%s-%s", kBackends[backend], kBBHs[bbh]);
 }
 
@@ -65,9 +65,6 @@ void QuiltTask::draw() {
         case kRTree_BBH:
             factory.reset(SkNEW(SkRTreeFactory));
             break;
-        case kQuadTree_BBH:
-            factory.reset(SkNEW(SkQuadTreeFactory));
-            break;
         case kTileGrid_BBH: {
             const SkTileGridFactory::TileGridInfo tiles = {
                 { FLAGS_quiltTile, FLAGS_quiltTile },