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This CL updates the Chrome D-Bus bindings and modifies the device/bluetooth
GATT Chrome OS code to use the new bindings defined in crbug.com/378182 for
descriptor value reads and writes.

BUG=378182
TEST=device_unittests; manual tests using custom bluetoothd

Review URL: https://codereview.chromium.org/309623002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275718 0039d316-1c4b-4281-b951-d872f2087c98