[ios] Automatically fail any WebTest whose render process crashes.

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 a4f2d6d72b97e02d58a738f2b9f4678216b1db1a..bc28f42ce3040d845f5d0694900a66226852ea50 100644
--- a/ios/web/web_state/ui/crw_web_controller_unittest.mm
+++ b/ios/web/web_state/ui/crw_web_controller_unittest.mm
@@ -1013,6 +1013,9 @@ class CRWWebControllerWebProcessTest : public web::WebTestWithWebController {
             initWithMockWebView:webView_
                      scrollView:[webView_ scrollView]]);
     [web_controller() injectWebViewContentView:webViewContentView];
+
+    // This test intentionally crashes the render process.
+    AllowRenderProcessCrashesDuringTesting(true);
   }
   base::scoped_nsobject<WKWebView> webView_;
 };