Refactor BaseBlockingPage to reduce duplicated code

chrome/browser/safe_browsing/ui_manager_unittest.cc

 // Copyright 2015 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 "chrome/browser/safe_browsing/ui_manager.h"
 
 #include "base/run_loop.h"
 #include "chrome/browser/safe_browsing/safe_browsing_blocking_page.h"
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
 #include "chrome/browser/safe_browsing/ui_manager.h"
@@ skipping 334 matching lines @@
             main_frame_url,
             unsafe_resources,
             SafeBrowsingErrorUI::SBErrorDisplayOptions(
                 BaseBlockingPage::IsMainPageLoadBlocked(unsafe_resources),
                 false,
                 false,
                 false,
                 false,
                 false)) {
     // Don't delay details at all for the unittest.
-    threat_details_proceed_delay_ms_ = 0;
+    SetThreatDetailsProceedDelayForTesting(0);
     DontCreateViewForTesting();
   }
 };
 
 // A factory that creates TestSafeBrowsingBlockingPages.
 class TestSafeBrowsingBlockingPageFactory
     : public SafeBrowsingBlockingPageFactory {
  public:
   TestSafeBrowsingBlockingPageFactory() {}
   ~TestSafeBrowsingBlockingPageFactory() override {}
@@ skipping 47 matching lines @@
   SimulateBlockingPageDone(resources, true);
   EXPECT_TRUE(delegate.visible_security_state_changed());
 
   waiter.WaitForCallback();
   EXPECT_TRUE(waiter.callback_called());
   EXPECT_TRUE(waiter.proceed());
   EXPECT_TRUE(IsWhitelisted(resource));
 }
 
 }  // namespace safe_browsing