Fixed memory leak in RTreeBench

http://codereview.appspot.com/6500101/



git-svn-id: http://skia.googlecode.com/svn/trunk@5478 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/RTreeBench.cpp b/bench/RTreeBench.cpp
index 2ee6dea..edea57d 100644
--- a/bench/RTreeBench.cpp
+++ b/bench/RTreeBench.cpp
@@ -36,6 +36,9 @@
             fName.append("_bulk");
         }
     }
+    virtual ~BBoxBuildBench() {
+        delete fTree;
+    }
 protected:
     virtual const char* onGetName() {
         return fName.c_str();
@@ -89,6 +92,9 @@
         }
         fTree->flushDeferredInserts();
     }
+    virtual ~BBoxQueryBench() {
+        delete fTree;
+    }
 protected:
     virtual const char* onGetName() {
         return fName.c_str();