Remove ChromeTabbedActivityTestBase.startActivityCompletely().

Remove ChromeTabbedActivityTestBase.startActivityCompletely().

This method was redundant with the method in ChromeActivityTestCaseBase
that it used to override.

Committed: https://crrev.com/279ad18a98ec8fa1013aa9fbd210301db9d2fcb4
Cr-Commit-Position: refs/heads/master@{#338188}

[newt (away), 2015-07-09 22:34:05]

newt@chromium.org changed reviewers:
+ dfalcantara@chromium.org

[newt (away), 2015-07-09 22:34:06]

PTAL

[newt (away), 2015-07-09 22:34:10]

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

[gone, 2015-07-09 22:34:34]

lgtm

[commit-bot: I haz the power, 2015-07-09 22:36:40]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1229913005/1

[commit-bot: I haz the power, 2015-07-09 23:10:51]

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

[commit-bot: I haz the power, 2015-07-09 23:10:52]

Dry run: This issue passed the CQ dry run.

[newt (away), 2015-07-09 23:34:12]

The CQ bit was checked by newt@chromium.org

[commit-bot: I haz the power, 2015-07-09 23:37:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1229913005/1

[commit-bot: I haz the power, 2015-07-09 23:47:43]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-09 23:49:10]

Patchset 1 (id:??) landed as
https://crrev.com/279ad18a98ec8fa1013aa9fbd210301db9d2fcb4
Cr-Commit-Position: refs/heads/master@{#338188}