Revert of Removing browser.Start() and instead starts the browser at the point of creation.

Revert of Removing browser.Start() and instead starts the browser at the point of creation. (patchset #6 id:120001 of https://codereview.chromium.org/565803002/)

Reason for revert:
investigate build error

Original issue's description:
> Removing browser.Start() and instead starts the browser at the point of creation.
>
> BUG=412126
>
> Committed: https://crrev.com/01c68e8765254d9971296b291ff718b4f6af3004
> Cr-Commit-Position: refs/heads/master@{#295591}
>
> Committed: https://crrev.com/74c6ef17a08754abadb6fb64da14249898285fa8
> Cr-Commit-Position: refs/heads/master@{#296107}

TBR=nednguyen@google.com,slamm@chromium.org,slamm@google.com
NOTREECHECKS=true
NOTRY=true
BUG=412126
Committed: https://crrev.com/de9555146d87d2daf5e2e1da425d46b8efc06415
Cr-Commit-Position: refs/heads/master@{#296247}

[wuhu, 2014-09-23 18:10:37]

Created Revert of Removing browser.Start() and instead starts the browser at the
point of creation.

[nednguyen, 2014-09-23 18:13:07]

lgtm

[commit-bot: I haz the power, 2014-09-23 20:31:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/601473002/1

[commit-bot: I haz the power, 2014-09-23 21:15:47]

Committed patchset #1 (id:1) as 0922870a1f25e68f841fde373d014eb4319f753a

[commit-bot: I haz the power, 2014-09-23 21:16:23]

Patchset 1 (id:??) landed as
https://crrev.com/de9555146d87d2daf5e2e1da425d46b8efc06415
Cr-Commit-Position: refs/heads/master@{#296247}