Fix presubmit error.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 5367c5f88a5123a617ed3c443160141927c1b37f..ef969241827637c1e9bea9c93cac279133c16dd6 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -650,7 +650,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_WeakMapGet) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 2);
   CONVERT_ARG_CHECKED(JSWeakMap, weakmap, 0);
-  // TODO (mstarzinger): Currently we cannot use JSProxy objects as keys
+  // TODO(mstarzinger): Currently we cannot use JSProxy objects as keys
   // because they cannot be cast to JSObject to get an identity hash code.
   CONVERT_ARG_CHECKED(JSObject, key, 1);
   return weakmap->table()->Lookup(*key);
@@ -661,7 +661,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_WeakMapSet) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 3);
   CONVERT_ARG_CHECKED(JSWeakMap, weakmap, 0);
-  // TODO (mstarzinger): See Runtime_WeakMapGet above.
+  // TODO(mstarzinger): See Runtime_WeakMapGet above.
   CONVERT_ARG_CHECKED(JSObject, key, 1);
   Handle<Object> value(args[2]);
   Handle<ObjectHashTable> table(weakmap->table());