Move FileHandlersInfo to /extensions and remove struct FileHandlersInfo

Move FileHandlersInfo to /extensions and remove struct FileHandlersInfo

Move FileHandlersParser to /extensions.
FileHandlersInfo was a struct which only contained a vector of FileHandlers.
Instead, typedef a vector of FileHandlers as a FileHandlersInfo.

BUG=374980
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=271750

[Yoyo Zhou, 2014-05-19 22:38:32]

LGTM, nice cleanup!

[Devlin, 2014-05-19 22:57:32]

+benwells@ and jackhou@ for c/b/web_applications/.  There shouldn't be any
functional changes, but it's probably more than a TBR.

[benwells, 2014-05-19 23:59:05]

lgtm

[jackhou1, 2014-05-20 05:02:01]

lgtm. Thanks! Removing FileHandlersInfo was on my todo list until now =)

[Devlin, 2014-05-20 16:29:18]

The CQ bit was checked by rdevlin.cronin@chromium.org

[commit-bot: I haz the power, 2014-05-20 16:30:19]

CQ is trying da patch. Follow status at

https://chromium-status.appspot.com/cq/rdevlin.cronin@chromium.org/280963002/...

[commit-bot: I haz the power, 2014-05-20 21:14:12]

Change committed as 271750