Remove SkQuadTree.

We're not testing it to the same degree we do RTree and TileGrid.  Any changes
we'll make to BBH APIs become 33% easier without it.  If find we want it again,
we can always resurrect it.

BUG=skia:1021,skia:2834
R=robertphillips@google.com, mtklein@google.com
TBR=reed

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/500373005
diff --git a/tools/bbh_shootout.cpp b/tools/bbh_shootout.cpp
index 27818de..2a827fd 100644
--- a/tools/bbh_shootout.cpp
+++ b/tools/bbh_shootout.cpp
@@ -23,7 +23,7 @@
 
 DEFINE_string2(skps, r, "", "The list of SKPs to benchmark.");
 DEFINE_string(bb_types, "", "The set of bbox types to test. If empty, all are tested. "
-                       "Should be one or more of none, quadtree, rtree, tilegrid.");
+                       "Should be one or more of none, rtree, tilegrid.");
 DEFINE_int32(record, 100, "Number of times to record each SKP.");
 DEFINE_int32(playback, 1, "Number of times to playback each SKP.");
 DEFINE_int32(tilesize, 256, "The size of a tile.");
@@ -36,7 +36,6 @@
 
 const char* kBBoxHierarchyTypeNames[kBBoxTypeCount] = {
     "none", // kNone_BBoxHierarchyType
-    "quadtree", // kQuadTree_BBoxHierarchyType
     "rtree", // kRTree_BBoxHierarchyType
     "tilegrid", // kTileGrid_BBoxHierarchyType
 };