Simplify SkBBH::insert API

No one's exploiting the ability to take ownership of the array anymore.

BUG=skia:

Review URL: https://codereview.chromium.org/913833002
diff --git a/tests/PictureTest.cpp b/tests/PictureTest.cpp
index 18af979..33e058c 100644
--- a/tests/PictureTest.cpp
+++ b/tests/PictureTest.cpp
@@ -1255,7 +1255,7 @@
         this->searchCalls++;
     }
 
-    void insert(SkAutoTMalloc<SkRect>*, int) SK_OVERRIDE {}
+    void insert(const SkRect[], int) SK_OVERRIDE {}
     virtual size_t bytesUsed() const SK_OVERRIDE { return 0; }
 };