[Merge to M51] Don't show the 'wallpaper-set-by-message' if the current wallpaper is set by the rig…

[Merge to M51] Don't show the 'wallpaper-set-by-message' if the current wallpaper is set by the right click menu of Files App.

Setting wallpaper from right click menu in 'Files' app is a feature that was implemented
in crbug.com/578935. Since 'Files' app is a built-in v1 app in ChromeOS, we should treat
it slightly differently with other third party apps: the wallpaper set by the 'Files' app
should still be syncable and it should not appear in the wallpaper grid in the Wallpaper Picker.
But we should not display the 'wallpaper-set-by-mesage' since it might introduce confusion
as shown in crbug.com/599407.

BUG=599407
TBR=bshe@chromium.org

Review-Url: https://codereview.chromium.org/1931713002
Cr-Commit-Position: refs/heads/master@{#391098}
(cherry picked from commit ddd4b8e014ac5c63e4447a5f6631521bf13819e8)

Committed: https://chromium.googlesource.com/chromium/src/+/347945a930183408d74eb6681916b39be82e6ecf

[xdai1, 2016-05-05 17:32:37]

Description was changed from

==========
[Merge to M51] Don't show the 'wallpaper-set-by-message' if the current
wallpaper is set by the right click menu of Files App.

Setting wallpaper from right click menu in 'Files' app is a feature that was
implemented
in crbug.com/578935. Since 'Files' app is a built-in v1 app in ChromeOS, we
should treat
it slightly differently with other third party apps: the wallpaper set by the
'Files' app
should still be syncable and it should not appear in the wallpaper grid in the
Wallpaper Picker.
But we should not display the 'wallpaper-set-by-mesage' since it might introduce
confusion
as shown in crbug.com/599407.

BUG=599407
TBR=bshe@chromium.org

Review-Url: https://codereview.chromium.org/1931713002
Cr-Commit-Position: refs/heads/master@{#391098}
(cherry picked from commit ddd4b8e014ac5c63e4447a5f6631521bf13819e8)
==========

to

==========
[Merge to M51] Don't show the 'wallpaper-set-by-message' if the current
wallpaper is set by the right click menu of Files App.

Setting wallpaper from right click menu in 'Files' app is a feature that was
implemented
in crbug.com/578935. Since 'Files' app is a built-in v1 app in ChromeOS, we
should treat
it slightly differently with other third party apps: the wallpaper set by the
'Files' app
should still be syncable and it should not appear in the wallpaper grid in the
Wallpaper Picker.
But we should not display the 'wallpaper-set-by-mesage' since it might introduce
confusion
as shown in crbug.com/599407.

BUG=599407
TBR=bshe@chromium.org

Review-Url: https://codereview.chromium.org/1931713002
Cr-Commit-Position: refs/heads/master@{#391098}
(cherry picked from commit ddd4b8e014ac5c63e4447a5f6631521bf13819e8)

Committed:
https://chromium.googlesource.com/chromium/src/+/347945a930183408d74eb6681916...
==========

[xdai1, 2016-05-05 17:32:39]

Committed patchset #1 (id:1) manually as
347945a930183408d74eb6681916b39be82e6ecf (presubmit successful).