Fix possible map::end() dereference in AppCacheUpdateJob triggered by a compromised renderer.

Fix possible map::end() dereference in AppCacheUpdateJob triggered by a compromised renderer.

BUG=551044
Committed: https://crrev.com/2cb006bc9d3ad16353ed49c2b75faea618156d0f
Cr-Commit-Position: refs/heads/master@{#358815}

[gzobqq, 2015-11-04 15:12:23]

Description was changed from

==========
Fix possible map::end() dereference in AppCacheUpdateJob triggered by a
compromised renderer.

BUG=551044
==========

to

==========
Fix possible map::end() dereference in AppCacheUpdateJob triggered by a
compromised renderer.

BUG=551044
==========

[gzobqq, 2015-11-04 15:12:23]

gzobqq@gmail.com changed reviewers:
+ michaeln@chromium.org

[gzobqq, 2015-11-04 15:13:49]

Michael, I suppose we'll need a test for this?

[gzobqq, 2015-11-06 13:51:03]

Moved the check to AppCacheHost. Added a test to AppCacheHostTest. Michael, PTAL

[michaeln, 2015-11-09 21:53:16]

lgtm!

[gzobqq, 2015-11-10 08:08:20]

The CQ bit was checked by gzobqq@gmail.com

[commit-bot: I haz the power, 2015-11-10 08:08:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1418783005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1418783005/20001

[commit-bot: I haz the power, 2015-11-10 10:29:04]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-11-10 10:29:47]

Patchset 2 (id:??) landed as
https://crrev.com/2cb006bc9d3ad16353ed49c2b75faea618156d0f
Cr-Commit-Position: refs/heads/master@{#358815}