Drop obsolete ES6 TODOs about activating extended mode.

test/mjsunit/harmony/block-let-semantics.js

 // Copyright 2011 the V8 project authors. All rights reserved.
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 // 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.
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 //       from this software without specific prior written permission.
 //
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 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --harmony-scoping
 
-// TODO(ES6): properly activate extended mode
 "use strict";
 
 // Test temporal dead zone semantics of let bound variables in
 // function and block scopes.
 
 function TestFunctionLocal(s) {
   try {
     eval("(function(){" + s + "; })")();
   } catch (e) {
     assertInstanceof(e, ReferenceError);
@@ skipping 140 matching lines @@
     }
     eval("1 + 1");
     return x + inner();
   }
 
   let x = 1;
   return middle();
 }
 
 assertEquals(2, outer());