[UI Views] Unset the extension keybinding registry on frame destruction

[UI Views] Unset the extension keybinding registry on frame destruction

Some destruction flows don't seem to call OnWidgetActivationChanged
before destroying the window, which causes the extension keybinding
registry reference in the global registry to become stale. Update the
active registry on deletion.

BUG=616970
Review-Url: https://codereview.chromium.org/2046653002
Cr-Commit-Position: refs/heads/master@{#398167}
(cherry picked from commit fbcfdaeb71885d8081579746bedfbc6c5b813f11)

Committed: https://chromium.googlesource.com/chromium/src/+/d83d3d08c885706910d00402cfec79cef265b665

[Devlin, 2016-06-14 23:54:03]

Description was changed from

==========
[UI Views] Unset the extension keybinding registry on frame destruction

Some destruction flows don't seem to call OnWidgetActivationChanged
before destroying the window, which causes the extension keybinding
registry reference in the global registry to become stale. Update the
active registry on deletion.

BUG=616970

Review-Url: https://codereview.chromium.org/2046653002
Cr-Commit-Position: refs/heads/master@{#398167}
(cherry picked from commit fbcfdaeb71885d8081579746bedfbc6c5b813f11)
==========

to

==========
[UI Views] Unset the extension keybinding registry on frame destruction

Some destruction flows don't seem to call OnWidgetActivationChanged
before destroying the window, which causes the extension keybinding
registry reference in the global registry to become stale. Update the
active registry on deletion.

BUG=616970

Review-Url: https://codereview.chromium.org/2046653002
Cr-Commit-Position: refs/heads/master@{#398167}
(cherry picked from commit fbcfdaeb71885d8081579746bedfbc6c5b813f11)

Committed:
https://chromium.googlesource.com/chromium/src/+/d83d3d08c885706910d00402cfec...
==========

[Devlin, 2016-06-14 23:54:04]

Committed patchset #1 (id:1) manually as
d83d3d08c885706910d00402cfec79cef265b665.