Bluetooth: use generic names for fake devices

Originally these names had been named based on similarly behaving
devices we had in our inventory, change the names of both the variables
and displayed names to be more generic and instead describe their
behavior.

BUG=346367
TEST=device_unittests

Review URL: https://codereview.chromium.org/189753002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255620 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255620