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 #5 id:80001 of https://codereview.chromium.org/565803002/)

Reason for revert:
missed changing constructor for CrOS browser

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}

TBR=nednguyen@google.com,slamm@chromium.org,slamm@google.com
NOTREECHECKS=true
NOTRY=true
BUG=412126
Committed: https://crrev.com/5080b5ed9029aa2e79096ec2041349364f9b95c0
Cr-Commit-Position: refs/heads/master@{#295791}

[wuhu, 2014-09-19 22:11:44]

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

[commit-bot: I haz the power, 2014-09-19 22:12:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/587853003/1

[commit-bot: I haz the power, 2014-09-19 22:12:48]

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

[commit-bot: I haz the power, 2014-09-19 22:12:50]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[nednguyen, 2014-09-19 22:13:11]

The CQ bit was checked by nednguyen@google.com

[nednguyen, 2014-09-19 22:13:16]

lgtm

[commit-bot: I haz the power, 2014-09-19 22:15:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/587853003/1

[commit-bot: I haz the power, 2014-09-19 22:17:08]

Committed patchset #1 (id:1) as 01f3f9dfedec366dd21abf3a22ec9226e28aa8c7

[commit-bot: I haz the power, 2014-09-19 22:17:39]

Patchset 1 (id:??) landed as
https://crrev.com/5080b5ed9029aa2e79096ec2041349364f9b95c0
Cr-Commit-Position: refs/heads/master@{#295791}