Move WebVR public headers into public/platform/modules/vr

Move WebVR public headers into public/platform/modules/vr

Since no Chrome code depends on these files yet (till https://codereview.chromium.org/829803003/ lands) this is an easy move to make now.

Also updated WebVRDevice to use WebString instead of WebUChar[]. The previous code was aimed at sending WebVRDevice's over Chrome's IPC channels.
The latest WebVR code uses mojo for IPC, and as such it's easier and safer to use WebString here instead.

BUG=453032
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=196885

[bajones, 2015-06-09 23:21:36]

bajones@chromium.org changed reviewers:
+ jochen@chromium.org, mkwst@chromium.org

[bajones, 2015-06-09 23:21:37]

While making a small update to WebVR.h I noticed that multiple other modules
public headers were moving into the modules/ folder, and the current lack of
Chrome dependencies made it seem like a good time to shuffle the files around.
PTAL!

[Mike West, 2015-06-10 07:38:58]

LGTM.

https://codereview.chromium.org/1165223006/diff/20001/public/platform/modules...
File public/platform/modules/vr/OWNERS (right):

https://codereview.chromium.org/1165223006/diff/20001/public/platform/modules...
public/platform/modules/vr/OWNERS:1: bajones@chromium.org
I'd suggest finding a partner so you're not all alone here. :)

[jochen (gone - plz use gerrit), 2015-06-10 08:34:58]

lgtm

[bajones, 2015-06-10 16:18:31]

The CQ bit was checked by bajones@chromium.org

[commit-bot: I haz the power, 2015-06-10 16:19:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1165223006/20001

[commit-bot: I haz the power, 2015-06-10 16:29:37]

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

[commit-bot: I haz the power, 2015-06-10 16:29:38]

Try jobs failed on following builders:
  mac_blink_rel on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/58406)

[bajones, 2015-06-10 16:55:29]

The CQ bit was checked by bajones@chromium.org

[bajones, 2015-06-10 16:55:29]

The patchset sent to the CQ was uploaded after l-g-t-m from jochen@chromium.org,
mkwst@chromium.org
Link to the patchset: https://codereview.chromium.org/1165223006/#ps40001
(title: "Fixed mismatched forward declaration")

[commit-bot: I haz the power, 2015-06-10 16:55:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1165223006/40001

[commit-bot: I haz the power, 2015-06-10 18:03:31]

Committed patchset #3 (id:40001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=196885