file_manager: getFileTasks() to return Drive apps iff all files are on Drive

file_manager: getFileTasks() to return Drive apps iff all files are on Drive

Previously, fileBrowserPrivate.getFileTasks() returned Drive app tasks
regardless of whether files were on Drive or not, and the results were
filtered in JS side with ".driveApp" field.

It's much simpler for getFileTasks() to return Drive app tasks only if
all files are on Drive. This way, we can get rid of the filtering logic
in JS, as well as the ".driveApp" field.

BUG=284242
TEST=Install Pixlr Editor from webstore; Launch Files.app; Confirm that Pixlr Editor is an option for a JPG file on Drive, but not an option for a JPG file on the local disk.
TBR=benwells@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=221230

[satorux1, 2013-09-04 02:00:00]

kinaba@ for everything
mtomasz@ for JS changes
benwells@ for chrome/common/extensions/api/file_browser_private.json

[mtomasz, 2013-09-04 02:05:38]

js lgtm

[kinaba, 2013-09-04 03:46:47]

lgtm

[satorux1, 2013-09-04 08:00:32]

TBRing benwlles, as the change in file_browser_private.json  is fairly minor.

[commit-bot: I haz the power, 2013-09-04 16:33:04]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/satorux@chromium.org/23477036/5001

[commit-bot: I haz the power, 2013-09-04 18:32:18]

Change committed as 221230