GitLab

Don't display the "charging not reliable" battery status in the 
non-charging-non-discharging state, as that can happen normally in
some circumstances. Also, update the string to be more human-friendly.

BUG=246336
TEST=manual, see bug

Review URL: https://chromiumcodereview.appspot.com/16057022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203952 0039d316-1c4b-4281-b951-d872f2087c98