[ARC] Converts part of ios/web/ui to ARC.

[ARC] Converts part of ios/web/ui to ARC.
Notable changes:
* crw_web_controller.mm used to have a dictionary storing selectors just
for keeping the KVO code clean. ARC cannot call a selector from a string
like this, because it cannot guarantee correct memory management in this
case. So it was replaced with an array of observed key paths to keep
some of the code cleanness, while the KVO callback has a huge switch.
* Filed crbug.com/652732 for unremovable WeakNSProtocols in some headers

BUG=651830

[stkhapugin, 2016-10-04 16:36:01]

The CQ bit was checked by stkhapugin@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-10-04 16:36:31]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-04 17:10:51]

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

[commit-bot: I haz the power, 2016-10-04 17:10:52]

Dry run: Try jobs failed on following builders:
  linux_android_rel_ng on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/linux_androi...)

[stkhapugin, 2016-10-07 09:25:56]

stkhapugin@chromium.org changed reviewers:
+ sdefresne@chromium.org

[stkhapugin, 2016-10-07 09:25:56]

PTAL

[stkhapugin, 2016-10-07 09:26:21]

Oops, disregard this CL, wrong tab!

[sdefresne, 2016-12-21 13:07:12]

Description was changed from

==========
[ARC] Converts part of ios/web/ui to ARC.
Notable changes:
* crw_web_controller.mm used to have a dictionary storing selectors just
for keeping the KVO code clean. ARC cannot call a selector from a string
like this, because it cannot guarantee correct memory management in this
case. So it was replaced with an array of observed key paths to keep
some of the code cleanness, while the KVO callback has a huge switch.
* Filed crbug.com/652732 for unremovable WeakNSProtocols in some headers

BUG=651830
==========

to

==========
[ARC] Converts part of ios/web/ui to ARC.
Notable changes:
* crw_web_controller.mm used to have a dictionary storing selectors just
for keeping the KVO code clean. ARC cannot call a selector from a string
like this, because it cannot guarantee correct memory management in this
case. So it was replaced with an array of observed key paths to keep
some of the code cleanness, while the KVO callback has a huge switch.
* Filed crbug.com/652732 for unremovable WeakNSProtocols in some headers

BUG=651830
==========

[sdefresne, 2016-12-21 13:07:12]

sdefresne@chromium.org changed reviewers:
- sdefresne@chromium.org