Site Settings Desktop: Fix NOTREACHED when group name is unregistered.

chrome/browser/ui/webui/site_settings_helper.h

 // Copyright 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_SITE_SETTINGS_HELPER_H_
 #define CHROME_BROWSER_UI_WEBUI_SITE_SETTINGS_HELPER_H_
 
 #include <map>
 #include <memory>
 #include <vector>
@@ skipping 21 matching lines @@
                  OnePatternSettings>
     AllPatternsSettings;
 
 extern const char kSetting[];
 extern const char kOrigin[];
 extern const char kPolicyProviderId[];
 extern const char kSource[];
 extern const char kEmbeddingOrigin[];
 extern const char kPreferencesSource[];
 
+// Returns whether a group name has been registered for the given type.
+bool HasRegisteredGroupName(ContentSettingsType type);
+
 // Gets a content settings type from the group name identifier.
 ContentSettingsType ContentSettingsTypeFromGroupName(const std::string& name);
 
 // Gets a string identifier for the group name.
 std::string ContentSettingsTypeToGroupName(ContentSettingsType type);
 
 // Fills in |exceptions| with Values for the given |type| from |map|.
 void GetExceptionsFromHostContentSettingsMap(
     const HostContentSettingsMap* map,
     ContentSettingsType type,
     content::WebUI* web_ui,
     base::ListValue* exceptions);
 
 // Returns exceptions constructed from the policy-set allowed URLs
 // for the content settings |type| mic or camera.
 void GetPolicyAllowedUrls(
     ContentSettingsType type,
     std::vector<std::unique_ptr<base::DictionaryValue>>* exceptions,
     content::WebUI* web_ui);
 
 }  // namespace site_settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SITE_SETTINGS_HELPER_H_