Using the correct WebTestDelegate from WebFrameTestClient.

components/test_runner/web_frame_test_client.h

Index: components/test_runner/web_frame_test_client.h
diff --git a/components/test_runner/web_frame_test_client.h b/components/test_runner/web_frame_test_client.h
index c0d8e46ae0ea940c9b4ea8ea6986055fdab09f14..7408cc7703711069a9ee8dc8414ca97772fed3da 100644
--- a/components/test_runner/web_frame_test_client.h
+++ b/components/test_runner/web_frame_test_client.h
@@ -28,7 +28,6 @@ class WebFrameTestClient : public blink::WebFrameClient {
   // Caller has to ensure that all arguments (|test_runner|, |delegate| and so
   // forth) live longer than |this|.
   WebFrameTestClient(TestRunner* test_runner,
-                     WebTestDelegate* delegate,
                      WebViewTestProxyBase* web_view_test_proxy_base,
                      WebFrameTestProxyBase* web_frame_test_proxy_base);
 
@@ -107,9 +106,10 @@ class WebFrameTestClient : public blink::WebFrameClient {
                       blink::WebFileChooserCompletion* completion) override;
 
  private:
+  WebTestDelegate* delegate();
+
   // Borrowed pointers to other parts of Layout Tests state.
   TestRunner* test_runner_;
-  WebTestDelegate* delegate_;
   WebViewTestProxyBase* web_view_test_proxy_base_;
   WebFrameTestProxyBase* web_frame_test_proxy_base_;