Make built-ins strict mode conforming, and support a --use-strict flag.

include/v8.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1180 matching lines @@
   V8EXPORT static Local<String> New(const uint16_t* data, int length = -1);
 
   /** Creates a symbol. Returns one if it exists already.*/
   V8EXPORT static Local<String> NewSymbol(const char* data, int length = -1);
 
   /**
    * Creates a new string by concatenating the left and the right strings
    * passed in as parameters.
    */
   V8EXPORT static Local<String> Concat(Handle<String> left,
-                                       Handle<String>right);
+                                       Handle<String> right);
 
   /**
    * Creates a new external string using the data defined in the given
    * resource. When the external string is no longer live on V8's heap the
    * resource will be disposed by calling its Dispose method. The caller of
    * this function should not otherwise delete or modify the resource. Neither
    * should the underlying buffer be deallocated or modified except through the
    * destructor of the external string resource.
    */
   V8EXPORT static Local<String> NewExternal(ExternalStringResource* resource);
@@ skipping 3070 matching lines @@
 
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_