bluetooth: Improve GATT disconnected error message.

third_party/WebKit/LayoutTests/bluetooth/script-tests/server/garbage-collection-ran-during-success.js

 'use strict';
 promise_test(() => {
   let promise;
   return setBluetoothFakeAdapter('DisconnectingHealthThermometerAdapter')
-    .then(() => requestDeviceWithKeyDown({
-      filters: [{services: ['health_thermometer']}]}))
-    .then(device => device.gatt.connect())
-    .then(gattServer => {
-      promise = assert_promise_rejects_with_message(
-        gattServer.CALLS([
-          getPrimaryService('health_thermometer')|
-          getPrimaryServices()|
-          getPrimaryServices('health_thermometer')[UUID]]),
-        new DOMException(
-          'GATT Server disconnected while retrieving services.',
-          'NetworkError'));
-      gattServer.disconnect();
-    })
-    .then(runGarbageCollection)
-    .then(() => promise);
+      .then(
+          () => requestDeviceWithKeyDown(
+              {filters: [{services: ['health_thermometer']}]}))
+      .then(device => device.gatt.connect())
+      .then(gattServer => {
+        promise = assert_promise_rejects_with_message(
+            gattServer.CALLS(
+                [getPrimaryService('health_thermometer') |
+                 getPrimaryServices() |
+                 getPrimaryServices('health_thermometer')[UUID]]),
+            new DOMException(
+                'GATT Server is disconnected. ' +
+                    'Cannot retrieve services. ' +
+                    '(Re)connect first with `device.gatt.connect`.',
+                'NetworkError'));
+        gattServer.disconnect();
+      })
+      .then(runGarbageCollection)
+      .then(() => promise);
 }, 'Garbage Collection ran during a FUNCTION_NAME call that succeeds. ' +
    'Should not crash.');