Wrap runtime.js in a function.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index f56bdb2cff0df7d70bdfa66b4a14244f1c8f53e1..361a5f5eec4a228864b2310f8844a24c73b88206 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2245,8 +2245,8 @@ class JSObject: public JSReceiver {
   // permissible values (see the DCHECK in heap.cc).
   static const int kInitialMaxFastElementArray = 100000;
 
-  // This constant applies only to the initial map of "$Object" aka
-  // "global.Object" and not to arbitrary other JSObject maps.
+  // This constant applies only to the initial map of "global.Object" and
+  // not to arbitrary other JSObject maps.
   static const int kInitialGlobalObjectUnusedPropertiesCount = 4;
 
   static const int kMaxInstanceSize = 255 * kPointerSize;