Add a policy to disable proceeding through the Safe Browsing interstitials.

chrome/browser/safe_browsing/safe_browsing_blocking_page.h

 // 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.
 //
 // Classes for managing the SafeBrowsing interstitial pages.
 //
 // When a user is about to visit a page the SafeBrowsing system has deemed to
 // be malicious, either as malware or a phishing page, we show an interstitial
 // page with some options (go back, continue) to give the user a chance to avoid
 // the harmful page.
@@ skipping 128 matching lines @@
   // Checks if we should even show the malware details option. For example, we
   // don't show it in incognito mode.
   bool CanShowMalwareDetailsOption();
 
   // Called when the insterstitial is going away. If there is a
   // pending malware details object, we look at the user's
   // preferences, and if the option to send malware details is
   // enabled, the report is scheduled to be sent on the |sb_service_|.
   void FinishMalwareDetails(int64 delay_ms);
 
+  // Returns the boolean value of the given |pref| from the PrefService of the
+  // Profile associated with |web_contents_|.
+  bool IsPrefEnabled(const char* pref);
+
   // A list of SafeBrowsingService::UnsafeResource for a tab that the user
   // should be warned about.  They are queued when displaying more than one
   // interstitial at a time.
   static UnsafeResourceMap* GetUnsafeResourcesMap();
 
   // Notifies the SafeBrowsingService on the IO thread whether to proceed or not
   // for the |resources|.
   static void NotifySafeBrowsingService(SafeBrowsingService* sb_service,
                                         const UnsafeResourceList& resources,
                                         bool proceed);
@@ skipping 56 matching lines @@
  public:
   virtual ~SafeBrowsingBlockingPageFactory() { }
 
   virtual SafeBrowsingBlockingPage* CreateSafeBrowsingPage(
       SafeBrowsingService* service,
       content::WebContents* web_contents,
       const SafeBrowsingBlockingPage::UnsafeResourceList& unsafe_resources) = 0;
 };
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_BLOCKING_PAGE_H_