[Media Router] Consistently refer to issue's learn more help page by ID.

[Media Router] Consistently refer to issue's learn more help page by ID.

When users click on "learn more" on an issue, there should be a new tab opened to the "learn more" link. Currently, some parts of Media Router assume that an Issue keeps track of a URL, whereas other places assume that it keeps track of the help page ID, which would later be concat'd to a help center URL prefix. This mismatch breaks the "learn more" link for any issues created in the extension.

This change makes Issues consistently refer to the help page ID.

Also fix presubmit warnings.

BUG=613242
Review-Url: https://codereview.chromium.org/1993373002
Cr-Commit-Position: refs/heads/master@{#395615}
(cherry picked from commit e68cd12ddd2fcc30c317c5725a5349ba0524be34)

Committed: https://chromium.googlesource.com/chromium/src/+/5b04f2be4168d4fece67a79a212e5b522a98ca0a

[apacible, 2016-05-26 17:47:48]

Description was changed from

==========
[Media Router] Consistently refer to issue's learn more help page by ID.

When users click on "learn more" on an issue, there should be a new tab opened
to the "learn more" link. Currently, some parts of Media Router assume that an
Issue keeps track of a URL, whereas other places assume that it keeps track of
the help page ID, which would later be concat'd to a help center URL prefix.
This mismatch breaks the "learn more" link for any issues created in the
extension.

This change makes Issues consistently refer to the help page ID.

Also fix presubmit warnings.

BUG=613242

Review-Url: https://codereview.chromium.org/1993373002
Cr-Commit-Position: refs/heads/master@{#395615}
(cherry picked from commit e68cd12ddd2fcc30c317c5725a5349ba0524be34)
==========

to

==========
[Media Router] Consistently refer to issue's learn more help page by ID.

When users click on "learn more" on an issue, there should be a new tab opened
to the "learn more" link. Currently, some parts of Media Router assume that an
Issue keeps track of a URL, whereas other places assume that it keeps track of
the help page ID, which would later be concat'd to a help center URL prefix.
This mismatch breaks the "learn more" link for any issues created in the
extension.

This change makes Issues consistently refer to the help page ID.

Also fix presubmit warnings.

BUG=613242

Review-Url: https://codereview.chromium.org/1993373002
Cr-Commit-Position: refs/heads/master@{#395615}
(cherry picked from commit e68cd12ddd2fcc30c317c5725a5349ba0524be34)

Committed:
https://chromium.googlesource.com/chromium/src/+/5b04f2be4168d4fece67a79a212e...
==========

[apacible, 2016-05-26 17:47:50]

Committed patchset #1 (id:1) manually as
5b04f2be4168d4fece67a79a212e5b522a98ca0a.