Refactor BaseBlockingPage to reduce duplicated code

chrome/browser/safe_browsing/safe_browsing_blocking_page_unittest.cc

 // Copyright (c) 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.
 
 #include <list>
 
 #include "base/run_loop.h"
 #include "chrome/browser/interstitials/chrome_controller_client.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/safe_browsing/safe_browsing_blocking_page.h"
@@ skipping 37 matching lines @@
       WebContents* web_contents,
       const GURL& main_frame_url,
       const UnsafeResourceList& unsafe_resources,
       const SafeBrowsingErrorUI::SBErrorDisplayOptions& display_options)
       : SafeBrowsingBlockingPage(manager,
                                  web_contents,
                                  main_frame_url,
                                  unsafe_resources,
                                  display_options) {
     // Don't delay details at all for the unittest.
-    threat_details_proceed_delay_ms_ = 0;
+    SetThreatDetailsProceedDelayForTesting(0);
     DontCreateViewForTesting();
   }
 };
 
 class TestSafeBrowsingBlockingPageFactory
     : public SafeBrowsingBlockingPageFactory {
  public:
   TestSafeBrowsingBlockingPageFactory() { }
   ~TestSafeBrowsingBlockingPageFactory() override {}
 
@@ skipping 702 matching lines @@
   // The interstitial should be gone.
   EXPECT_EQ(CANCEL, user_response());
   EXPECT_FALSE(GetSafeBrowsingBlockingPage());
 
   // No report should have been sent.
   EXPECT_EQ(0u, ui_manager_->GetThreatDetails()->size());
   ui_manager_->GetThreatDetails()->clear();
 }
 
 }  // namespace safe_browsing