Move DeclarativeUserScriptManager/Master and UserScriptLoader to //extensions.

Move DeclarativeUserScriptManager/Master and UserScriptLoader to //extensions.

BUG=461052
Committed: https://crrev.com/3b2b3dfcf72c9216da672ff5c64433655443bce5
Cr-Commit-Position: refs/heads/master@{#317801}

[Xi Han, 2015-02-23 22:06:14]

Patchset #1 (id:1) has been deleted

[Xi Han, 2015-02-23 22:17:00]

hanxi@chromium.org changed reviewers:
+ yoz@chromium.org

[Xi Han, 2015-02-23 22:17:01]

Hi yoz@: one simple CL which just mechanically moves several script injection
related classes (browser side) to //extensions:) These classes will be used by
WebViewGuest which is in extensions now.

Please take a look, thanks!

[Yoyo Zhou, 2015-02-23 22:24:22]

LGTM

[Xi Han, 2015-02-24 14:32:12]

The CQ bit was checked by hanxi@chromium.org

[commit-bot: I haz the power, 2015-02-24 14:32:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/955473002/20001

[commit-bot: I haz the power, 2015-02-24 15:28:19]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2015-02-24 15:28:50]

Patchset 1 (id:??) landed as
https://crrev.com/3b2b3dfcf72c9216da672ff5c64433655443bce5
Cr-Commit-Position: refs/heads/master@{#317801}