Fix crash in app list view delegate.

Fix crash in app list view delegate.

This CL fixes an issue where an observer was not removed from the
app list view delegate when the profile was set to nullptr. This caused
a crash if the TemplateURLService notified the app list view delegate.

BUG=620220
Committed: https://crrev.com/ca75961e35cc647ae8375768b67d61276e14465a
Cr-Commit-Position: refs/heads/master@{#401541}

[calamity, 2016-06-21 08:10:33]

calamity@chromium.org changed reviewers:
+ mgiuca@chromium.org

[Matt Giuca, 2016-06-22 02:02:18]

lgtm

[calamity, 2016-06-23 04:10:40]

The CQ bit was checked by calamity@chromium.org

[commit-bot: I haz the power, 2016-06-23 04:10:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2082933002/1

[commit-bot: I haz the power, 2016-06-23 04:49:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-23 04:51:13]

Description was changed from

==========
Fix crash in app list view delegate.

This CL fixes an issue where an observer was not removed from the
app list view delegate when the profile was set to nullptr. This caused
a crash if the TemplateURLService notified the app list view delegate.

BUG=620220
==========

to

==========
Fix crash in app list view delegate.

This CL fixes an issue where an observer was not removed from the
app list view delegate when the profile was set to nullptr. This caused
a crash if the TemplateURLService notified the app list view delegate.

BUG=620220

Committed: https://crrev.com/ca75961e35cc647ae8375768b67d61276e14465a
Cr-Commit-Position: refs/heads/master@{#401541}
==========

[commit-bot: I haz the power, 2016-06-23 04:51:15]

Patchset 1 (id:??) landed as
https://crrev.com/ca75961e35cc647ae8375768b67d61276e14465a
Cr-Commit-Position: refs/heads/master@{#401541}