Fix cpplint whitespace/comments issues

Change-Id: Iae286862c85fb8fd8901eae1204cd6d271d69496
diff --git a/runtime/indirect_reference_table.cc b/runtime/indirect_reference_table.cc
index 0287d74..0616d28 100644
--- a/runtime/indirect_reference_table.cc
+++ b/runtime/indirect_reference_table.cc
@@ -309,7 +309,7 @@
 }
 
 void IndirectReferenceTable::VisitRoots(RootVisitor* visitor, void* arg) {
-  typedef IndirectReferenceTable::iterator It; // TODO: C++0x auto
+  typedef IndirectReferenceTable::iterator It;  // TODO: C++0x auto
   for (It it = begin(), end = this->end(); it != end; ++it) {
     visitor(**it, arg);
   }