Moved adding listeners on webview from load to constructor

Moved adding listeners on webview from load to constructor

Current implementation causes same multiple listeners wait for an event after we load page several times. E.g. in ChromeOS: add user->cancel->add user. After login we get multiple identical messages.

BUG=426316
TEST=manual

Committed: https://crrev.com/823b2ac81df6cd3859462c32c370598120666676
Cr-Commit-Position: refs/heads/master@{#315286}

[Roman Sorokin (ftl), 2015-02-06 13:54:05]

rsorokin@chromium.org changed reviewers:
+ xiyuan@chromium.org

[Roman Sorokin (ftl), 2015-02-06 13:54:06]

Xiyuan, please review

[xiyuan, 2015-02-06 16:44:28]

lgtm

Good catch. Neglected that .load could be called multiple times.

[Roman Sorokin (ftl), 2015-02-09 07:17:17]

The CQ bit was checked by rsorokin@chromium.org

[commit-bot: I haz the power, 2015-02-09 07:18:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/905653003/1

[commit-bot: I haz the power, 2015-02-09 07:42:27]

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

[commit-bot: I haz the power, 2015-02-09 07:42:27]

Try jobs failed on following builders:
  ios_dbg_simulator on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)

[Roman Sorokin (ftl), 2015-02-09 08:08:13]

The CQ bit was checked by rsorokin@chromium.org

[commit-bot: I haz the power, 2015-02-09 08:08:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/905653003/1

[commit-bot: I haz the power, 2015-02-09 08:49:01]

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

[commit-bot: I haz the power, 2015-02-09 08:49:01]

Try jobs failed on following builders:
  android_dbg_tests_recipe on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/android_dbg_tes...)

[Roman Sorokin (ftl), 2015-02-09 11:38:29]

The CQ bit was checked by rsorokin@chromium.org

[commit-bot: I haz the power, 2015-02-09 11:39:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/905653003/1

[commit-bot: I haz the power, 2015-02-09 13:28:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-09 13:29:12]

Patchset 1 (id:??) landed as
https://crrev.com/823b2ac81df6cd3859462c32c370598120666676
Cr-Commit-Position: refs/heads/master@{#315286}