Update Google API keys header comment.

Update Google API keys header comment.

Mention that env var overrides don't work in Google Chrome builds.

BUG=710575
Review-Url: https://codereview.chromium.org/2958463002
Cr-Commit-Position: refs/heads/master@{#481872}
Committed: https://chromium.googlesource.com/chromium/src/+/8d06e9e1d811adc8b28cf9b65552e9affe6ce60e

[robertshield, 2017-06-23 04:12:30]

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

[commit-bot: I haz the power, 2017-06-23 04:12:46]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[robertshield, 2017-06-23 04:17:43]

robertshield@chromium.org changed reviewers:
+ rogerta@chromium.org

[commit-bot: I haz the power, 2017-06-23 04:27:00]

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

[commit-bot: I haz the power, 2017-06-23 04:27:01]

Dry run: Try jobs failed on following builders:
  android_arm64_dbg_recipe on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_arm6...)

[Roger Tawa OOO till Jul 10th, 2017-06-23 11:19:01]

lgtm

[robertshield, 2017-06-23 13:10:16]

The CQ bit was checked by robertshield@chromium.org

[commit-bot: I haz the power, 2017-06-23 13:10:29]

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, 2017-06-23 14:09:20]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1498223416479830, "parent_rev":
"0c0ed3be51e0487b4a210f8a77ff714358d9b95e", "commit_rev":
"8d06e9e1d811adc8b28cf9b65552e9affe6ce60e"}

[commit-bot: I haz the power, 2017-06-23 14:09:33]

Description was changed from

==========
Update Google API keys header comment.

Mention that env var overrides don't work in Google Chrome builds.

BUG=710575
==========

to

==========
Update Google API keys header comment.

Mention that env var overrides don't work in Google Chrome builds.

BUG=710575

Review-Url: https://codereview.chromium.org/2958463002
Cr-Commit-Position: refs/heads/master@{#481872}
Committed:
https://chromium.googlesource.com/chromium/src/+/8d06e9e1d811adc8b28cf9b65552...
==========

[commit-bot: I haz the power, 2017-06-23 14:09:33]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/8d06e9e1d811adc8b28cf9b65552...