bluetooth: Remove old WebBluetooth::requestDevice signature.
bluetooth: Remove old WebBluetooth::requestDevice signature.

Across 5 patches due to content/blink repository split:

Create a blink::WebBluetoothDevice interface and migrate the
blink::WebBluetooth::requestDevice interface to use it.

Also, Move the mock implementation from content/child to
content/browser.

http://crrev.com/718503002 Define new requestDevice and WebBluetoothDevice.
http://crrev.com/699843003 Impl uses new WebBluetoothDevice in content/browser.
http://crrev.com/715613005 Request and receive WebBluetoothDevice from embedder.
http://crrev.com/712153002 Remove old WebBluetoothImpl::requestDevice impl.
http://crrev.com/713043005 Remove old WebBluetooth::requestDevice signature.

BUG=421668

Review URL: https://codereview.chromium.org/713043005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@186087 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs