Fixed the <webview> context menu bug.

Fixed the <webview> context menu bug.

The chrome-specific web_view event code was not fully updated during the guest_view_events refactor, resulting in the one chrome-specific event, 'contextmenu', not working properly. This patch updates that code.

BUG=465194
Committed: https://crrev.com/a6da2e4352d6e0bb0496aaa2e03274c44cbb5083
Cr-Commit-Position: refs/heads/master@{#319701}

[paulmeyer, 2015-03-09 16:02:30]

Patchset #2 (id:20001) has been deleted

[paulmeyer, 2015-03-09 16:02:42]

Patchset #1 (id:1) has been deleted

[paulmeyer, 2015-03-09 16:03:42]

paulmeyer@chromium.org changed reviewers:
+ fsamuel@chromium.org

[paulmeyer, 2015-03-09 16:03:43]

+fsamuel@

[Fady Samuel, 2015-03-09 16:06:49]

lgtm

[paulmeyer, 2015-03-09 16:07:16]

The CQ bit was checked by paulmeyer@chromium.org

[commit-bot: I haz the power, 2015-03-09 16:07:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/989173005/40001

[commit-bot: I haz the power, 2015-03-09 18:45:40]

Committed patchset #1 (id:40001)

[commit-bot: I haz the power, 2015-03-09 18:46:11]

Patchset 1 (id:??) landed as
https://crrev.com/a6da2e4352d6e0bb0496aaa2e03274c44cbb5083
Cr-Commit-Position: refs/heads/master@{#319701}