Fix cpplint whitespace/comments issues

Change-Id: Iae286862c85fb8fd8901eae1204cd6d271d69496
diff --git a/runtime/reference_table.h b/runtime/reference_table.h
index 4b6b50e..e369fd0 100644
--- a/runtime/reference_table.h
+++ b/runtime/reference_table.h
@@ -53,7 +53,7 @@
   typedef std::vector<const mirror::Object*> Table;
   static void Dump(std::ostream& os, const Table& entries)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
-  friend class IndirectReferenceTable; // For Dump.
+  friend class IndirectReferenceTable;  // For Dump.
 
   std::string name_;
   Table entries_;