bluetooth: Remove indicator only when there are no more devices connected

content/browser/bluetooth/bluetooth_dispatcher_host.cc

Index: content/browser/bluetooth/bluetooth_dispatcher_host.cc
diff --git a/content/browser/bluetooth/bluetooth_dispatcher_host.cc b/content/browser/bluetooth/bluetooth_dispatcher_host.cc
index 71f66c3f8083cded7e21ab6bc9cd23c1b93de6cf..8827894b6288e86bf0e9f1cd7bc35c4f5c1f676d 100644
--- a/content/browser/bluetooth/bluetooth_dispatcher_host.cc
+++ b/content/browser/bluetooth/bluetooth_dispatcher_host.cc
@@ -712,18 +712,19 @@ void BluetoothDispatcherHost::OnGATTServerDisconnect(
     return;
   }
 
-  RenderFrameHostImpl* render_frame_host =
-      RenderFrameHostImpl::FromID(render_process_id_, frame_routing_id);
-  WebContents* web_contents =
-      WebContents::FromRenderFrameHost(render_frame_host);
-  if (web_contents) {
-    web_contents->SetBluetoothDeviceConnected(false);
-  }
-
   // The last BluetoothGattConnection for a device closes the connection when
   // it's destroyed.
   if (device_id_to_connection_map_.erase(device_id)) {
     VLOG(1) << "Disconnecting device: " << device_id;
+
+    // Indicate there is one less connected device.

[Jeffrey Yasskin, 2016/04/06 23:05:13]

Add a TODO here saying that this can miss disconnections, and that we should
improve it once we're done Mojoifying connections. (Or a more accurate statement
of the problem and plan.)

[ortuno, 2016/04/07 15:09:20]

Done.

+    RenderFrameHostImpl* render_frame_host =
+        RenderFrameHostImpl::FromID(render_process_id_, frame_routing_id);
+    WebContents* web_contents =
+        WebContents::FromRenderFrameHost(render_frame_host);
+    if (web_contents) {
+      web_contents->DecrementBluetoothConnectedDeviceCount();
+    }
   }
 }
 
@@ -1420,7 +1421,7 @@ void BluetoothDispatcherHost::OnGATTConnectionCreated(
   WebContents* web_contents =
       WebContents::FromRenderFrameHost(render_frame_host);
   if (web_contents) {
-    web_contents->SetBluetoothDeviceConnected(true);
+    web_contents->IncrementBluetoothConnectedDeviceCount();
   }
   Send(new BluetoothMsg_GATTServerConnectSuccess(thread_id, request_id));
 }