Refactor: Move common login-related resources out of c/b/resources/chromeos/login

These are files used by both the CrOS and Desktop user managers, 
which means they probably shouldn't live just in CrOS land.
The .grd fix is because those 3 icons are used by the user manager
on desktop as well, not just on CrOS.

BUG=NONE

Review URL: https://codereview.chromium.org/148993003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253470 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253470
Android: allows logging of autofield values, part 2.

Filters out non-empty fields since they won't be autofilled.

BUG=b/13118743

Review URL: https://codereview.chromium.org/179413003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253471 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253471