Move component updater artifacts into component_updater namespace.

Move component updater artifacts into component_updater namespace.

sky@ please look at the files in chrome/browser for owner approval.

Long term, the idea is to unify several updaters in Chrome, so having a specific namespace could help avoiding name conflicts.

Short term, the change reduces some naming verbosity in the implementation but makes the call site names longer, so it is a wash.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=245596

[cpu_(ooo_6.6-7.5), 2014-01-16 01:55:09]

lgtm on the component_updater folder unless the changes become non-mechanical
name adding/removal.

[Sorin Jianu, 2014-01-17 02:48:24]

Sky@, please look at files chrome/browser for an owner approval.

Thank you!

[sky, 2014-01-17 15:54:32]

c/b LGTM

[waffles, 2014-01-17 18:33:51]

lgtm

[commit-bot: I haz the power, 2014-01-17 18:38:08]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sorin@chromium.org/138553004/290001

[commit-bot: I haz the power, 2014-01-17 20:22:36]

Change committed as 245596