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A small number of devices cannot be paired, but can at least be
connected to insecurely. Support these by marking the devices as
Trusted, which causes BlueZ to remember the device and which allows
future incoming connections from them.

Make IsPaired() return true for these devices, there's no reason in
the UI to treat these any differently than paired devices.

TBR=youngki@chromium.org
BUG=232145
TEST=device_unittests

Review URL: https://codereview.chromium.org/14225017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195021 0039d316-1c4b-4281-b951-d872f2087c98