DevTools: [shell] front-end does not show context menu for content shell.

BUG=316625

Review URL: https://codereview.chromium.org/99323004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238689 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238689
Return Entry instead of URL from in the fileBrowserPrivate.onDirectoryChanged.

We are getting rid of raw paths and URLs in favor of Entry, whereever possible.
This CL creates the real Entry object in custom bindings.

TEST=browser_tests for the FileWatcher. Also, tested manually.
BUG=324202

Review URL: https://codereview.chromium.org/101453002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238690 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238690