GitLab

Modified chrome.bluetooth API code to use the new discovery session API for
device discovery.

This CL is the same as r255262 which was reverted due to a memory leak. The leak
has been addressed in this patch.

BUG=346982,349942
TEST=1. Run unit_tests and browser_tests with LSan.
     2. Use multiple running extension instances with the bluetooth permission
        and check for the following behavior:
        - Only one session per extension. Calling chrome.bluetooth.stopDiscovery
          from one running app should fail if that app never called
          chrome.bluetooth.startDiscovery.
        - An app's discovery sessions should get cleaned up if that app crashes
          or unloads.
        - Use bt_console and run "power off". This should cause all discovery
          sessions that have been assigned to apps to get marked as inactive.
          Verify by requesting a new discovery session from apps, which should
          succeed.

Review URL: https://codereview.chromium.org/189463002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255609 0039d316-1c4b-4281-b951-d872f2087c98