[ios] Refactored dialogs suppression.

ios/web/web_state/ui/crw_web_controller_unittest.mm

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/web/web_state/ui/crw_web_controller.h"
 
 #import <WebKit/WebKit.h>
 
 #include <utility>
 
@@ skipping 532 matching lines @@
             }];
 
   [webController_ setPageDialogOpenPolicy:web::DIALOG_POLICY_ALLOW];
   EvaluateJavaScriptAsString(@"alert('test')");
 };
 
 // Tests that window.confirm dialog is suppressed for DIALOG_POLICY_SUPPRESS.
 TEST_F(CRWWebControllerPageDialogOpenPolicyTest, SuppressConfirm) {
   [[web_delegate_mock() expect] webControllerDidSuppressDialog:webController_];
   [webController_ setPageDialogOpenPolicy:web::DIALOG_POLICY_SUPPRESS];
-  EXPECT_NSEQ(@"", EvaluateJavaScriptAsString(@"confirm('test')"));
+  EXPECT_NSEQ(@"false", EvaluateJavaScriptAsString(@"confirm('test')"));
 };
 
 // Tests that window.confirm dialog is shown for DIALOG_POLICY_ALLOW and
 // it's result is true.
 TEST_F(CRWWebControllerPageDialogOpenPolicyTest, AllowConfirmWithTrue) {
   SEL selector = @selector(webController:
       runJavaScriptConfirmPanelWithMessage:
                                 requestURL:
                          completionHandler:);
   [ui_delegate_mock() onSelector:selector
@@ skipping 424 matching lines @@
 
   [webController_ setDelegate:delegate];
   web::SimulateWKWebViewCrash(webView_);
 
   EXPECT_OCMOCK_VERIFY(delegate);
   EXPECT_FALSE([webController_ isViewAlive]);
   [webController_ setDelegate:nil];
 };
 
 }  // namespace