Make the strict-mode calling convention for contextual calls the default one.

test/mjsunit/harmony/object-observe.js

 // Copyright 2012 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 129 matching lines @@
 assertTrue(notifyDesc.configurable);
 assertTrue(notifyDesc.writable);
 assertFalse(notifyDesc.enumerable);
 assertThrows(function() { notifier.notify({}); }, TypeError);
 assertThrows(function() { notifier.notify({ type: 4 }); }, TypeError);
 
 assertThrows(function() { notifier.performChange(1, function(){}); }, TypeError);
 assertThrows(function() { notifier.performChange(undefined, function(){}); }, TypeError);
 assertThrows(function() { notifier.performChange('foo', undefined); }, TypeError);
 assertThrows(function() { notifier.performChange('foo', 'bar'); }, TypeError);
+var global = this;
 notifier.performChange('foo', function() {
-  assertEquals(undefined, this);
+  assertEquals(global, this);
 });
 
 var notify = notifier.notify;
 assertThrows(function() { notify.call(undefined, { type: 'a' }); }, TypeError);
 assertThrows(function() { notify.call(null, { type: 'a' }); }, TypeError);
 assertThrows(function() { notify.call(5, { type: 'a' }); }, TypeError);
 assertThrows(function() { notify.call('hello', { type: 'a' }); }, TypeError);
 assertThrows(function() { notify.call(false, { type: 'a' }); }, TypeError);
 assertThrows(function() { notify.call({}, { type: 'a' }); }, TypeError);
 assertFalse(recordCreated);
@@ skipping 1617 matching lines @@
     for (var n1 = 0; n1 < 3; ++n1)
       for (var n2 = 0; n2 < 3; ++n2)
         for (var i in mutation)
           TestFastElementsLength(mutation[i], b1 != 0, b2 != 0, 20*n1, 20*n2);
 
 for (var b1 = 0; b1 < 2; ++b1)
   for (var b2 = 0; b2 < 2; ++b2)
     for (var n = 0; n < 3; ++n)
       for (var i in mutationByIncr)
         TestFastElementsLength(mutationByIncr[i], b1 != 0, b2 != 0, 7*n, 7*n+1);