Add WebWidgetTestProxy.

components/test_runner/web_test_interfaces.h

Index: components/test_runner/web_test_interfaces.h
diff --git a/components/test_runner/web_test_interfaces.h b/components/test_runner/web_test_interfaces.h
index 2a73e7b7e85816d1ee791cf3b553ac20c6fac41e..6bf9ef1b7f69db68e63e1e3a85799aba274e30cf 100644
--- a/components/test_runner/web_test_interfaces.h
+++ b/components/test_runner/web_test_interfaces.h
@@ -35,6 +35,7 @@ class WebFrameTestClient;
 class WebFrameTestProxyBase;
 class WebTestDelegate;
 class WebViewTestProxyBase;
+class WebWidgetTestProxyBase;
 class WebTestRunner;
 class WebViewTestClient;
 class WebWidgetTestClient;
@@ -86,9 +87,9 @@ class TEST_RUNNER_EXPORT WebTestInterfaces {
   // Creates a WebWidgetClient implementation providing test behavior (i.e.
   // providing a mocked screen orientation).  The caller should guarantee that
   // the returned pointer won't be used beyond the lifetime of WebTestInterfaces
-  // and/or the lifetime of |web_view_test_proxy_base|.
+  // and/or the lifetime of |web_widget_test_proxy_base|.
   std::unique_ptr<WebWidgetTestClient> CreateWebWidgetTestClient(
-      WebViewTestProxyBase* web_view_test_proxy_base);
+      WebWidgetTestProxyBase* web_widget_test_proxy_base);
 
   // Gets a list of currently opened windows created by the current test.
   std::vector<blink::WebView*> GetWindowList();