Gallery.app: Does not open files not having an image exntension in their file name.

Gallery.app: Does not open files not having an image exntension in their file name.

Currently Galley opens files that have an image/* mime type. But ThumbnailLoader
does not generate an image for the files correctly.

BUG=415022
TEST=Download an image file with invalid extension, and select it in Files.app.

Committed: https://crrev.com/f56be5c3b2ad0e788b6c68c76a98ed987c9f5379
Cr-Commit-Position: refs/heads/master@{#295425}

[hirono, 2014-09-18 04:44:27]

hirono@chromium.org changed reviewers:
+ yoshiki@chromium.org

[hirono, 2014-09-18 04:44:28]

PTAL the CL? Thank you!

[yoshiki, 2014-09-18 04:45:07]

lgtm

[hirono, 2014-09-18 05:10:00]

The CQ bit was checked by hirono@chromium.org

[commit-bot: I haz the power, 2014-09-18 05:11:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/577003005/20001

[commit-bot: I haz the power, 2014-09-18 06:09:45]

Committed patchset #2 (id:20001) as f446e3e0d511431cb31293389a02ec5ae1a95f1f

[commit-bot: I haz the power, 2014-09-18 06:10:33]

Patchset 2 (id:??) landed as
https://crrev.com/f56be5c3b2ad0e788b6c68c76a98ed987c9f5379
Cr-Commit-Position: refs/heads/master@{#295425}