Files.app: Allow to make EntryLocation for fake entries.

Fake entries express the special search on drive.  These are not entry but can
have location inofrmation such as a volume information and root type.  This CL
allows to make EntryLocation for fake entries, which helps to remove constant
paths from PathUtil.

BUG=302090
TEST=manually
R=mtomasz@chromium.org

Review URL: https://codereview.chromium.org/96383003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237906 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237906
[SyncFS] Fix conflict resolver invocation

BUG=324411
NOTRY=true

Review URL: https://codereview.chromium.org/95603007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237907 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237907