Further refactoring of SBER1 preference usage.

components/safe_browsing_db/safe_browsing_prefs.h

 // Copyright (c) 2016 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.
 //
 // Safe Browsing preferences and some basic utility functions for using them.
 
 #ifndef COMPONENTS_SAFE_BROWSING_DB_SAFE_BROWSING_PREFS_H_
 #define COMPONENTS_SAFE_BROWSING_DB_SAFE_BROWSING_PREFS_H_
 
 class PrefService;
 
 namespace prefs {
 extern const char kSafeBrowsingExtendedReportingEnabled[];
 }
 
 namespace safe_browsing {
 
+// Returns whether the currently active Safe Browsing Extended Reporting
+// preference exists (eg: has been set before).
+bool ExtendedReportingPrefExists(const PrefService& prefs);
+
 // Returns the name of the Safe Browsing Extended Reporting pref that is
 // currently in effect. The specific pref in-use may change through experiments.
 const char* GetExtendedReportingPrefName();
 
 // Returns whether Safe Browsing Extended Reporting is currently enabled.
 // This should be used to decide if any of the reporting preferences are set,
 // regardless of which specific one is set.
 bool IsExtendedReportingEnabled(const PrefService& prefs);
 
 // Updates UMA metrics about Safe Browsing Extended Reporting states.
 void RecordExtendedReportingMetrics(const PrefService& prefs);
 
+// Sets the currently active Safe Browsing Extended Reporting preference to the
+// specified value.
+void SetExtendedReportingPref(PrefService* prefs, bool value);
+
 }  // namespace safe_browsing
 
 #endif  // COMPONENTS_SAFE_BROWSING_DB_SAFE_BROWSING_PREFS_H_