Put new global var semantics behind a flag until WebKit tests are cleaned up.

test/cctest/test-decls.cc

 // Copyright 2007-2008 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 503 matching lines @@
   }
 
   // Use the prototype as the holder for the interceptors.
   virtual Local<ObjectTemplate> GetHolder(Local<FunctionTemplate> function) {
     return function->PrototypeTemplate();
   }
 };
 
 
 TEST(ExistsInPrototype) {
+  i::FLAG_es52_globals = true;
   HandleScope scope;
 
   // Sanity check to make sure that the holder of the interceptor
   // really is the prototype object.
   { ExistsInPrototypeContext context;
     context.Check("this.x = 87; this.x",
                   0,
                   0,
                   0,
                   EXPECT_RESULT, Number::New(87));
@@ skipping 42 matching lines @@
   }
 
   // Use the prototype as the holder for the interceptors.
   virtual Local<ObjectTemplate> GetHolder(Local<FunctionTemplate> function) {
     return function->PrototypeTemplate();
   }
 };
 
 
 TEST(AbsentInPrototype) {
+  i::FLAG_es52_globals = true;
   HandleScope scope;
 
   { AbsentInPrototypeContext context;
     context.Check("if (false) { var x = 0; }; x",
                   0,
                   0,
                   0,  // declaration
                   EXPECT_RESULT, Undefined());
   }
 }