Revert of Factor Chrome details out of update manifest fetching.

Revert of Factor Chrome details out of update manifest fetching. (patchset #5 of https://codereview.chromium.org/465543004/)

Reason for revert:
Doesn't compile on all chromium.chrome buildbots (official).

Original issue's description:
> Factor Chrome details out of update manifest fetching.
> 
> This establishes a ManifestFetchDataDelegate for use
> by ExtensionDownloader and ManifestFetchData, and moves
> ManifestFetchData into //extensions/browser/updater.
> 
> The delegate provides implementation details for
> update manifest fetching, including brand code,
> boilerplate query parameters, and ping data.
> 
> Chrome's implementation has knowledge of the
> Google brand, the metrics service, and Omaha-specific
> query parameters necessary for CRX item queries.
> 
> BUG=398671
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=289800

TBR=kalman@chromium.org,isherman@chromium.org,rockot@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=398671
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=289821

[Nikita (slow), 2014-08-15 08:33:21]

Created Revert of Factor Chrome details out of update manifest fetching.

[commit-bot: I haz the power, 2014-08-15 08:34:58]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/nkostylev@chromium.org/476073002/1

[commit-bot: I haz the power, 2014-08-15 08:37:36]

Committed patchset #1 (1) as 289821