Correct iOS build for latest Xcode beta.

ios/web/web_state/ui/crw_web_controller_unittest.mm

Index: ios/web/web_state/ui/crw_web_controller_unittest.mm
diff --git a/ios/web/web_state/ui/crw_web_controller_unittest.mm b/ios/web/web_state/ui/crw_web_controller_unittest.mm
index 830504a9584298099ab7dc91ac1ea049696d8c48..864a176b8177d79e99091d3419078ccb6fb2c960 100644
--- a/ios/web/web_state/ui/crw_web_controller_unittest.mm
+++ b/ios/web/web_state/ui/crw_web_controller_unittest.mm
@@ -839,9 +839,11 @@ TEST_F(CRWWKWebViewWebControllerTest, SSLError) {
       [NSError errorWithDomain:NSURLErrorDomain
                           code:NSURLErrorServerCertificateHasUnknownRoot
                       userInfo:nil];
-  [static_cast<id<WKNavigationDelegate>>(webController_.get()) webView:nil
-                                          didFailProvisionalNavigation:nil
-                                                             withError:error];
+  [static_cast<id<WKNavigationDelegate>>(webController_.get())
+                           webView:static_cast<WKWebView*>(
+                                       [webController_ webView])
+      didFailProvisionalNavigation:nil
+                         withError:error];
 
   // Verify correctness of delegate's method arguments.
   EXPECT_TRUE([mockDelegate_ SSLInfo].is_valid());