[Extensions Docs] Update browser/page action documentation

[Extensions Docs] Update browser/page action documentation

Update the documentation to indicate that the space is 16-dip (a change
with MD chrome) and document that the extension system can handle any
size in the manifest and will look for the closest one.

BUG=636989
Committed: https://crrev.com/67980d379af2b88f530d51f0f7f608cd92707ec9
Cr-Commit-Position: refs/heads/master@{#427397}

[Devlin, 2016-10-25 16:13:53]

rdevlin.cronin@chromium.org changed reviewers:
+ asargent@chromium.org

[Devlin, 2016-10-25 16:13:53]

Antony, mind taking a look?

[asargent_no_longer_on_chrome, 2016-10-25 17:27:09]

lgtm

[Devlin, 2016-10-25 17:27:53]

The CQ bit was checked by rdevlin.cronin@chromium.org

[commit-bot: I haz the power, 2016-10-25 17:28:19]

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, 2016-10-25 17:37:25]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-25 17:43:49]

Description was changed from

==========
[Extensions Docs] Update browser/page action documentation

Update the documentation to indicate that the space is 16-dip (a change
with MD chrome) and document that the extension system can handle any
size in the manifest and will look for the closest one.

BUG=636989
==========

to

==========
[Extensions Docs] Update browser/page action documentation

Update the documentation to indicate that the space is 16-dip (a change
with MD chrome) and document that the extension system can handle any
size in the manifest and will look for the closest one.

BUG=636989

Committed: https://crrev.com/67980d379af2b88f530d51f0f7f608cd92707ec9
Cr-Commit-Position: refs/heads/master@{#427397}
==========

[commit-bot: I haz the power, 2016-10-25 17:43:51]

Patchset 1 (id:??) landed as
https://crrev.com/67980d379af2b88f530d51f0f7f608cd92707ec9
Cr-Commit-Position: refs/heads/master@{#427397}