Move ExtensionDownloader to //extensions

Move ExtensionDownloader to //extensions

This is a mechanical move with opportunistic clang_format
applied for cleanup.

This also introduces a dependency on //google_apis within
//extensions/browser.

BUG=398671
Committed: https://crrev.com/05f40a92987303ac217e68cec183cf9d19ffa290
Cr-Commit-Position: refs/heads/master@{#299957}

[Ken Rockot(use gerrit already), 2014-10-15 22:54:56]

rockot@chromium.org changed reviewers:
+ asargent@chromium.org

[Ken Rockot(use gerrit already), 2014-10-15 22:55:30]

Antony could you take a look?

[Ken Rockot(use gerrit already), 2014-10-15 22:59:32]

Patchset #1 (id:1) has been deleted

[Ken Rockot(use gerrit already), 2014-10-15 23:00:20]

rockot@chromium.org changed reviewers:
+ jamescook@chromium.org

[Ken Rockot(use gerrit already), 2014-10-15 23:00:21]

James, could you also take a look for //e/b/DEPS?

A while back, I looked into moving the identity/oauth stuff out of
//google_apis/gaia and into its own component, but it seemed like it would
create a decent amount of churn for very little benefit.

[asargent_no_longer_on_chrome, 2014-10-15 23:43:00]

lgtm

[James Cook, 2014-10-16 16:21:35]

DEPS lgtm

[Ken Rockot(use gerrit already), 2014-10-16 16:34:18]

The CQ bit was checked by rockot@chromium.org

[commit-bot: I haz the power, 2014-10-16 16:35:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/654363002/10001

[commit-bot: I haz the power, 2014-10-16 16:44:10]

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

[commit-bot: I haz the power, 2014-10-16 16:44:10]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[Ken Rockot(use gerrit already), 2014-10-16 16:47:59]

rockot@chromium.org changed reviewers:
+ rogerta@chromium.org

[Ken Rockot(use gerrit already), 2014-10-16 16:47:59]

Woops. +rogerta for //google_apis/gaia OWNERs (adding to
//extensions/browser/DEPS)

[Roger Tawa OOO till Jul 10th, 2014-10-16 19:32:23]

lgtm

[Ken Rockot(use gerrit already), 2014-10-16 19:33:30]

The CQ bit was checked by rockot@chromium.org

[commit-bot: I haz the power, 2014-10-16 19:34:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/654363002/10001

[commit-bot: I haz the power, 2014-10-16 19:40:35]

Committed patchset #1 (id:10001)

[commit-bot: I haz the power, 2014-10-16 19:42:01]

Patchset 1 (id:??) landed as
https://crrev.com/05f40a92987303ac217e68cec183cf9d19ffa290
Cr-Commit-Position: refs/heads/master@{#299957}