GitLab

Implement IsNonNativeLocalPathDirectory for supporting non-local non-Drive directory access in apps.

What the CL does is:
* Almost mechanically moves out the local function CheckIfDirectoryExists
from open_util.cc to fileapi_util.cc and just use it for the desired implementation.
* Removes Drive-specific helper code for the feature.
* Allows file_system_api test setup code to refer the info of File Manager app.
(Because the new general implementation checks the directory existence in the
permission level of the file manager, the test needs access to it.)

BUG=367028

Review URL: https://codereview.chromium.org/304373004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274173 0039d316-1c4b-4281-b951-d872f2087c98