Move status bar color setting to ChromeActivity.

Move status bar color setting to ChromeActivity.

Relanding https://codereview.chromium.org/1364043003/ after fixing
Svelte crash and CustomTabs test failure.

- Svelte was crashing due to getActivityTab being null when
  onOverviewModeFinishedHiding is called.
- CustomTabsActivity sets the status bar color explicitly and
  does not need to inherit setStatusBarColor calls from ChromeActivity.

BUG=535235, 536698
Committed: https://crrev.com/ea566c8cf38dfcf6564ac0c8994b832736e99a8a
Cr-Commit-Position: refs/heads/master@{#351182}

[aurimas (slooooooooow), 2015-09-28 18:56:32]

aurimas@chromium.org changed reviewers:
+ yusufo@chromium.org

[aurimas (slooooooooow), 2015-09-28 18:56:33]

PTAL

[aurimas (slooooooooow), 2015-09-28 19:44:23]

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

[commit-bot: I haz the power, 2015-09-28 19:45:48]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1375693002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1375693002/1

[Yusuf, 2015-09-28 20:01:32]

lgtm

[aurimas (slooooooooow), 2015-09-28 20:26:04]

aurimas@chromium.org changed reviewers:
+ tedchoc@chromium.org

[aurimas (slooooooooow), 2015-09-28 20:26:04]

+tedchoc for OWNERS review.

[Ted C, 2015-09-28 21:14:03]

lgtm

[aurimas (slooooooooow), 2015-09-28 21:14:18]

The CQ bit was checked by aurimas@chromium.org

[aurimas (slooooooooow), 2015-09-28 21:14:18]

The patchset sent to the CQ was uploaded after l-g-t-m from yusufo@chromium.org
Link to the patchset: https://chromiumcodereview.appspot.com/1375693002/#ps20001
(title: "Update test to check for status bar color")

[commit-bot: I haz the power, 2015-09-28 21:15:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1375693002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1375693002/20001

[commit-bot: I haz the power, 2015-09-28 22:44:08]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-28 22:45:55]

Patchset 2 (id:??) landed as
https://crrev.com/ea566c8cf38dfcf6564ac0c8994b832736e99a8a
Cr-Commit-Position: refs/heads/master@{#351182}