[es6] Remove Scanner and Parser flags for harmony_modules

[es6] Remove Scanner and Parser flags for harmony_modules

These flags weren't doing any real work, since the decision of whether some
source code is a script or module is made outside the parser (currently,
by the V8 API).

The only behavior change in this patch is to always parse 'import' and
'export' as their Token values, which changes the error message from
"Unexpected reserved word" to "Unexpected token import" (which doesn't
seem particularly harmful).

Committed: https://crrev.com/5c34bacb727e031da0dad96d0a3ee55df40a09b9
Cr-Commit-Position: refs/heads/master@{#30034}

[adamk, 2015-08-05 01:03:55]

adamk@chromium.org changed reviewers:
+ rossberg@chromium.org

[rossberg, 2015-08-05 08:02:40]

LGTM, modulo build problem

[adamk, 2015-08-05 15:55:33]

The CQ bit was checked by adamk@chromium.org

[adamk, 2015-08-05 15:55:34]

The patchset sent to the CQ was uploaded after l-g-t-m from
rossberg@chromium.org
Link to the patchset: https://codereview.chromium.org/1262913003/#ps20001
(title: "Remove call to SetHarmonyModules from test-parsing")

[commit-bot: I haz the power, 2015-08-05 15:55:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1262913003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1262913003/20001

[commit-bot: I haz the power, 2015-08-05 16:08:33]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-05 16:08:34]

Try jobs failed on following builders:
  v8_linux64_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_rel/builds/8406)
  v8_mac_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel/builds/8435)

[adamk, 2015-08-05 17:12:56]

The CQ bit was checked by adamk@chromium.org

[adamk, 2015-08-05 17:12:56]

The patchset sent to the CQ was uploaded after l-g-t-m from
rossberg@chromium.org
Link to the patchset: https://codereview.chromium.org/1262913003/#ps40001
(title: "Add flag-setting to cctests")

[commit-bot: I haz the power, 2015-08-05 17:13:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1262913003/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1262913003/40001

[commit-bot: I haz the power, 2015-08-05 17:59:44]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-08-05 18:00:15]

Patchset 3 (id:??) landed as
https://crrev.com/5c34bacb727e031da0dad96d0a3ee55df40a09b9
Cr-Commit-Position: refs/heads/master@{#30034}