Revert of Fix an errant pylint change. (https://codereview.chromium.org/143623007/)

Reason for revert:
crbug.com/342539 is likely happening because of the patch that this patch depends on. I need to ensure that logcats work on the bots before relanding (and that the corresponding steps fail if they don't.)

Original issue's description:
> I broke something by removing an apparently unused import that actually was used elsewhere. I addressed the issue by having the client code just call android_commands.GetAttachedDevices explicitly.
> 
> BUG=168518
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=250206

TBR=craigdh@chromium.org,frankf@chromium.org,cjhopman@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=168518

Review URL: https://codereview.chromium.org/159453002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250264 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 250264