Drop obsolete ES6 TODOs about activating extended mode.

test/mjsunit/harmony/block-leave.js

 // Copyright 2011 the V8 project authors. All rights reserved.
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 // met:
 //
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 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // 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";
 
 // We want to test the context chain shape.  In each of the tests cases
 // below, the outer with is to force a runtime lookup of the identifier 'x'
 // to actually verify that the inner context has been discarded.  A static
 // lookup of 'x' might accidentally succeed.
 
 {
   let x = 2;
   L: {
@@ skipping 177 matching lines @@
       let x = 'inner';
       throw 0;
     } finally {
       f();
       assertEquals('outer', eval('x'));
     }
   })('outer');
 } catch (e) {
   if (e instanceof MjsUnitAssertionError) throw e;
 }