bluetooth: Use BluetoothAdapter in BluetoothDispatcherHost.

content/child/bluetooth/bluetooth_dispatcher.cc

Index: content/child/bluetooth/bluetooth_dispatcher.cc
diff --git a/content/child/bluetooth/bluetooth_dispatcher.cc b/content/child/bluetooth/bluetooth_dispatcher.cc
index 882453f281d088118d75f007809a6148f6914383..41a28a9ee2738d1b042b7b4a1618df7bdc6e297a 100644
--- a/content/child/bluetooth/bluetooth_dispatcher.cc
+++ b/content/child/bluetooth/bluetooth_dispatcher.cc
@@ -105,6 +105,7 @@ void BluetoothDispatcher::OnRequestDeviceSuccess(
     int thread_id,
     int request_id,
     const std::string& device_instance_id) {
+  DCHECK(pending_requests_.Lookup(request_id)) << request_id;
   pending_requests_.Lookup(request_id)
       ->onSuccess(
           new WebBluetoothDevice(WebString::fromUTF8(device_instance_id)));
@@ -114,6 +115,7 @@ void BluetoothDispatcher::OnRequestDeviceSuccess(
 void BluetoothDispatcher::OnRequestDeviceError(int thread_id,
                                                int request_id,
                                                BluetoothError error_type) {
+  DCHECK(pending_requests_.Lookup(request_id)) << request_id;
   pending_requests_.Lookup(request_id)
       ->onError(new WebBluetoothError(
           WebBluetoothErrorFromBluetoothError(error_type), ""));