Fix valgrind gtests and memory leaks.

All tests pass other than image_test which passes if some bad reads
are disabled (buzbee working on this).

Change-Id: Ifd6b6e3aed0bc867703b6e818353a9f296609422
diff --git a/runtime/gc/allocator/rosalloc.cc b/runtime/gc/allocator/rosalloc.cc
index e86bee6..e13bd71 100644
--- a/runtime/gc/allocator/rosalloc.cc
+++ b/runtime/gc/allocator/rosalloc.cc
@@ -93,6 +93,12 @@
   }
 }
 
+RosAlloc::~RosAlloc() {
+  for (size_t i = 0; i < kNumOfSizeBrackets; i++) {
+    delete size_bracket_locks_[i];
+  }
+}
+
 void* RosAlloc::AllocPages(Thread* self, size_t num_pages, byte page_map_type) {
   lock_.AssertHeld(self);
   DCHECK(page_map_type == kPageMapRun || page_map_type == kPageMapLargeObject);