[Android] Reland CommandLine reset listeners.

[Android] Reland CommandLine reset listeners.

This is a reland of https://codereview.chromium.org/1254973003, which I
had reverted in https://codereview.chromium.org/1263433002 because I
thought all calls to FeatureUtilities.isDocumentMode would now happen
after CommandLineFlags.setUp was called. This was mistaken and has
broken L bots.

BUG=516421
TBR=yfriedman@chromium.org,dgn@chromium.org

Committed: https://crrev.com/cb98f483a972190366ba611e34563d44e5288676
Cr-Commit-Position: refs/heads/master@{#341639}

[jbudorick, 2015-08-03 23:19:37]

jbudorick@chromium.org changed reviewers:
+ dgn@chromium.org, yfriedman@chromium.org

[jbudorick, 2015-08-03 23:19:38]

TBR: fixing L bots.

[jbudorick, 2015-08-03 23:19:41]

The CQ bit was checked by jbudorick@chromium.org

[commit-bot: I haz the power, 2015-08-03 23:20:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1269083005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1269083005/1

[commit-bot: I haz the power, 2015-08-03 23:25:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-03 23:25:58]

Patchset 1 (id:??) landed as
https://crrev.com/cb98f483a972190366ba611e34563d44e5288676
Cr-Commit-Position: refs/heads/master@{#341639}