bluetooth: Create Mojo equivalent of SetBluetoothMockDataSet

third_party/WebKit/LayoutTests/bluetooth/iframeRequestDevice.html

Index: third_party/WebKit/LayoutTests/bluetooth/iframeRequestDevice.html
diff --git a/third_party/WebKit/LayoutTests/bluetooth/iframeRequestDevice.html b/third_party/WebKit/LayoutTests/bluetooth/iframeRequestDevice.html
index 5449b2f57617d2d8294d82332ea999a4463c805e..37be32e9b4879785b4551081b9f6e955fd56c52b 100644
--- a/third_party/WebKit/LayoutTests/bluetooth/iframeRequestDevice.html
+++ b/third_party/WebKit/LayoutTests/bluetooth/iframeRequestDevice.html
@@ -36,12 +36,14 @@
       });
     });
 
-    testRunner.setBluetoothMockDataSet('HeartRateAdapter');
-    for (let i = 0; i < numIframes; i++) {
-      let iframe = document.createElement('iframe');
-      iframe.src = 'resources/requestDevice-in-iframe.html';
-      document.body.appendChild(iframe);
-    }
+    return setBluetoothFakeAdapter('HeartRateAdapter')
+      .then(() => {
+        for (let i = 0; i < numIframes; i++) {
+          let iframe = document.createElement('iframe');
+          iframe.src = 'resources/requestDevice-in-iframe.html';
+          document.body.appendChild(iframe);
+        }
+      });
   }, 'Concurrent requestDevice calls in iframes work.');
   </script>
 </body>