Revert of [Extensions] Don't count bubble dismissal from focus loss as acknowledgment

Revert of [Extensions] Don't count bubble dismissal from focus loss as acknowledgment (patchset #5 id:120001 of https://codereview.chromium.org/1437683004/ )

Reason for revert:
Broken MSAN: http://build.chromium.org/p/chromium.memory.fyi/builders/Chromium%20OS%20%28valgrind%29%281%29/builds/40036

Original issue's description:
> [Extensions] Don't count bubble dismissal from focus loss as acknowledgment
>
> Currently, if an extension message bubble is shown, and then it is dismissed
> because it loses focus, we treat it the same as the user clicking the dismiss
> button - which serves as acknowledging the extension.  We could ignore focus
> loss, but this makes for very noisy, awkward bubbles.  Instead, allow the bubble
> to close, but don't treat this as user acknowledgment, and show the bubble again
> on next startup.
>
> This also involves tracking the close reason for a BubbleDelegateView.
>
> BUG=548269
>
> Committed: https://crrev.com/1462f63a60f9c7e1e53a3a42f70afc214d67fa71
> Cr-Commit-Position: refs/heads/master@{#360373}

TBR=finnur@chromium.org,sky@chromium.org,avi@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=548269
Committed: https://crrev.com/9389d54c588ad3bc1d57033f721cfec9972f445d
Cr-Commit-Position: refs/heads/master@{#360439}

[Devlin, 2015-11-18 23:11:00]

Created Revert of [Extensions] Don't count bubble dismissal from focus loss as
acknowledgment

[commit-bot: I haz the power, 2015-11-18 23:11:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1456213002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1456213002/1

[commit-bot: I haz the power, 2015-11-18 23:15:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-18 23:16:54]

Patchset 1 (id:??) landed as
https://crrev.com/9389d54c588ad3bc1d57033f721cfec9972f445d
Cr-Commit-Position: refs/heads/master@{#360439}