Ensure that entries are correctly removed from the MimeHandlerViewContainer map

Ensure that entries are correctly removed from the MimeHandlerViewContainer map

Currently if the RenderFrame is destroyed prior to the MimeHandlerViewContainer
then we will look for the wrong entry in the map. This fixes that issue by
removing the entry when the RenderFrame is destroyed.

Committed: https://crrev.com/35f1f31e8b1519382fe6796a0c235b9ba7cd76c1
Cr-Commit-Position: refs/heads/master@{#313418}

[raymes, 2015-01-27 03:04:14]

raymes@chromium.org changed reviewers:
+ sammc@chromium.org

[Sam McNally, 2015-01-27 03:18:06]

lgtm

[raymes, 2015-01-27 03:46:53]

The CQ bit was checked by raymes@chromium.org

[commit-bot: I haz the power, 2015-01-27 03:47:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/874293004/20001

[commit-bot: I haz the power, 2015-01-27 03:53:43]

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

[commit-bot: I haz the power, 2015-01-27 03:53:44]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[raymes, 2015-01-28 00:34:59]

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

[raymes, 2015-01-28 00:35:00]

+fsamuel for OWNERS

[Fady Samuel, 2015-01-28 00:37:53]

lgtm

[raymes, 2015-01-28 00:38:06]

The CQ bit was checked by raymes@chromium.org

[commit-bot: I haz the power, 2015-01-28 00:42:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/874293004/20001

[commit-bot: I haz the power, 2015-01-28 00:46:20]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-01-28 00:48:22]

Patchset 2 (id:??) landed as
https://crrev.com/35f1f31e8b1519382fe6796a0c235b9ba7cd76c1
Cr-Commit-Position: refs/heads/master@{#313418}