bluetooth: Improve GATT disconnected error message.

third_party/WebKit/LayoutTests/bluetooth/server/getPrimaryService/gen-device-disconnects-before.html

Index: third_party/WebKit/LayoutTests/bluetooth/server/getPrimaryService/gen-device-disconnects-before.html
diff --git a/third_party/WebKit/LayoutTests/bluetooth/server/getPrimaryService/gen-device-disconnects-before.html b/third_party/WebKit/LayoutTests/bluetooth/server/getPrimaryService/gen-device-disconnects-before.html
index c4e53f571f0be14bd81d403eb8f66b14e8c29b8d..6a3cf5b4fbed2dc3cb8f5682a3fa8c70a6813b23 100644
--- a/third_party/WebKit/LayoutTests/bluetooth/server/getPrimaryService/gen-device-disconnects-before.html
+++ b/third_party/WebKit/LayoutTests/bluetooth/server/getPrimaryService/gen-device-disconnects-before.html
@@ -7,20 +7,23 @@
 'use strict';
 promise_test(t => {
   return setBluetoothFakeAdapter('DisconnectingHeartRateAdapter')
-    .then(() => requestDeviceWithKeyDown({
-      filters: [{services: ['heart_rate']}],
-      optionalServices: [request_disconnection_service_uuid]
-    }))
-    .then(device => {
-      return device.gatt.connect()
-        .then(gattServer => get_request_disconnection(gattServer))
-        .then(requestDisconnection => requestDisconnection())
-        .then(() => assert_promise_rejects_with_message(
-          device.gatt.getPrimaryService('heart_rate'),
-          new DOMException(
-            'GATT Server is disconnected. Cannot retrieve services.',
-            'NetworkError')));
-    });
+      .then(() => requestDeviceWithKeyDown({
+              filters: [{services: ['heart_rate']}],
+              optionalServices: [request_disconnection_service_uuid]
+            }))
+      .then(device => {
+        return device.gatt.connect()
+            .then(gattServer => get_request_disconnection(gattServer))
+            .then(requestDisconnection => requestDisconnection())
+            .then(
+                () => assert_promise_rejects_with_message(
+                    device.gatt.getPrimaryService('heart_rate'),
+                    new DOMException(
+                        'GATT Server is disconnected. ' +
+                            'Cannot retrieve services. ' +
+                            '(Re)connect first with `device.gatt.connect`.',
+                        'NetworkError')));
+      });
 }, 'Device disconnects before getPrimaryService. Reject with NetworkError.');
 
 </script>