Remove more superfluous calls to clear frame views during destruction.

Remove more superfluous calls to clear frame views during destruction.

The calls in ~FrameTree aren't needed, since the view is always cleared
in detach().

BUG=none

Committed: https://crrev.com/8844981696a05f72b6814771a74bec4e410ad71e
Cr-Commit-Position: refs/heads/master@{#361472}

[dcheng, 2015-11-21 00:04:35]

dcheng@chromium.org changed reviewers:
+ esprehn@chromium.org

[dcheng, 2015-11-21 00:04:35]

Just cleaning up some loose ends.

[dcheng, 2015-11-24 19:22:15]

dcheng@chromium.org changed reviewers:
+ japhet@chromium.org

[dcheng, 2015-11-24 19:22:15]

+japhet, mind taking a look?

[esprehn, 2015-11-24 19:33:12]

lgtm

[dcheng, 2015-11-24 19:43:29]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2015-11-24 19:46:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1469583002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1469583002/1

[commit-bot: I haz the power, 2015-11-24 22:23:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-24 22:24:19]

Patchset 1 (id:??) landed as
https://crrev.com/8844981696a05f72b6814771a74bec4e410ad71e
Cr-Commit-Position: refs/heads/master@{#361472}