bluetooth: Create Mojo equivalent of SetBluetoothMockDataSet

third_party/WebKit/LayoutTests/bluetooth/disconnect-frame-detached/detach-gc.html

Index: third_party/WebKit/LayoutTests/bluetooth/disconnect-frame-detached/detach-gc.html
diff --git a/third_party/WebKit/LayoutTests/bluetooth/disconnect-frame-detached/detach-gc.html b/third_party/WebKit/LayoutTests/bluetooth/disconnect-frame-detached/detach-gc.html
index f8802ea2cce8d1ff860d8fa715ffb8ff45da8df7..403218b18b2e06cb56f00a03c39c800b8a7e9789 100644
--- a/third_party/WebKit/LayoutTests/bluetooth/disconnect-frame-detached/detach-gc.html
+++ b/third_party/WebKit/LayoutTests/bluetooth/disconnect-frame-detached/detach-gc.html
@@ -14,6 +14,7 @@
         });
       } else if (messageEvent.data === 'Connected') {
         // Detach
+        let iframe = document.querySelector('iframe');
         iframe.remove();
         // GC
         runGarbageCollection().then(() => test.done());
@@ -21,10 +22,12 @@
         assert_unreached('iframe sent invalid data: ' + messageEvent.data);
       }
     });
-    testRunner.setBluetoothMockDataSet('HeartRateAdapter');
-    let iframe = document.createElement('iframe');
-    iframe.src = '../resources/connect-iframe.html';
-    document.body.appendChild(iframe);
+    setBluetoothFakeAdapter('HeartRateAdapter')
+      .then(() => {
+        let iframe = document.createElement('iframe');
+        iframe.src = '../resources/connect-iframe.html';
+        document.body.appendChild(iframe);
+      });
   }, 'Detach frame then garbage collect. We shouldn\'t crash.');
   </script>
 </body>