Clean up verbose logging.

Change-Id: I6b01980e7145c4f8d25a5b50f620903f61a1b427
diff --git a/src/mark_sweep.cc b/src/mark_sweep.cc
index d44796c..9078340 100644
--- a/src/mark_sweep.cc
+++ b/src/mark_sweep.cc
@@ -565,9 +565,7 @@
 
 MarkSweep::~MarkSweep() {
 #ifndef NDEBUG
-  if (Heap::IsVerboseHeap()) {
-    LOG(INFO) << "MarkSweep scanned classes=" << class_count_ << " arrays=" << array_count_ << " other=" << other_count_;
-  }
+  VLOG(heap) << "MarkSweep scanned classes=" << class_count_ << " arrays=" << array_count_ << " other=" << other_count_;
 #endif
   delete mark_stack_;
   mark_bitmap_->Clear();