Return const references in the Blink SW API where possible

Return const references in the Blink SW API where possible

BUG=

Review-Url: https://codereview.chromium.org/2767343004
Cr-Commit-Position: refs/heads/master@{#459739}
Committed: https://chromium.googlesource.com/chromium/src/+/f644d8ec735b8602295d045fddfdc43ad654b3cb

[Peter Beverloo, 2017-03-24 17:54:31]

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

[Peter Beverloo, 2017-03-24 17:55:03]

peter@chromium.org changed reviewers:
+ kinuko@chromium.org

[Peter Beverloo, 2017-03-24 17:55:04]

+kinuko

[commit-bot: I haz the power, 2017-03-24 17:55:17]

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, 2017-03-24 19:54:04]

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

[commit-bot: I haz the power, 2017-03-24 19:54:05]

Dry run: This issue passed the CQ dry run.

[kinuko, 2017-03-27 05:56:42]

lgtm

[kinuko, 2017-03-27 05:56:47]

The CQ bit was checked by kinuko@chromium.org

[commit-bot: I haz the power, 2017-03-27 05:57:04]

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, 2017-03-27 08:40:09]

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

[commit-bot: I haz the power, 2017-03-27 08:40:10]

Try jobs failed on following builders:
  linux_chromium_asan_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Peter Beverloo, 2017-03-27 09:20:34]

The CQ bit was checked by peter@chromium.org

[commit-bot: I haz the power, 2017-03-27 09:20:55]

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, 2017-03-27 10:10:26]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490606434695220, "parent_rev":
"0abae6ede51df11750de244ac7831390484b9cb0", "commit_rev":
"f644d8ec735b8602295d045fddfdc43ad654b3cb"}

[commit-bot: I haz the power, 2017-03-27 10:11:15]

Description was changed from

==========
Return const references in the Blink SW API where possible

BUG=
==========

to

==========
Return const references in the Blink SW API where possible

BUG=

Review-Url: https://codereview.chromium.org/2767343004
Cr-Commit-Position: refs/heads/master@{#459739}
Committed:
https://chromium.googlesource.com/chromium/src/+/f644d8ec735b8602295d045fddfd...
==========

[commit-bot: I haz the power, 2017-03-27 10:11:18]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/f644d8ec735b8602295d045fddfd...