text input focus: RemoveObserver when RenderProcessHost exits.

text input focus: RemoveObserver when RenderProcessHost exits.

Makes sure that a WebView as RenderProcessHostObserver is removed from RenderProcessHost's observer list when RenderProcessHost exits.

BUG=290701
Committed: https://crrev.com/e3bd3d03b895a14e811912a06162efa316668ff9
Cr-Commit-Position: refs/heads/master@{#313662}

[Yuki, 2015-01-28 09:37:08]

yukishiino@chromium.org changed reviewers:
+ sky@chromium.org

[Yuki, 2015-01-28 09:37:09]

sky@, could you review this CL?
I've added a call to RemoveObserver as you suggested at
http://crrev.com/862643002 .

[sky, 2015-01-28 21:06:01]

LGTM - thanks

[Yuki, 2015-01-29 03:54:07]

The CQ bit was checked by yukishiino@chromium.org

[commit-bot: I haz the power, 2015-01-29 03:54:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/878383002/1

[commit-bot: I haz the power, 2015-01-29 03:59:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-29 04:00:07]

Patchset 1 (id:??) landed as
https://crrev.com/e3bd3d03b895a14e811912a06162efa316668ff9
Cr-Commit-Position: refs/heads/master@{#313662}