Removed most of path utility functions in Files app.

This patch removes some random dependencies to PathUtils and migrates to LocationInfo in that places. Also, most of the path utilities were removed.

TEST=Tested manually. Partly browser_tests.
BUG=320967

Review URL: https://codereview.chromium.org/148193002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247951 0039d316-1c4b-4281-b951-d872f2087c98
[Mac] The GAIA profile photo should be resized in the Users controller menu

BUG=327087
TEST=Start chrome with the --google-profile-info flag, and a signed in
user. If you choose 'Users' for the top menu bar, the signed in user's
profile photo should be the same size as the other items.

Review URL: https://codereview.chromium.org/149513007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247952 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247952