Add a policy and pref to control whether deleting browsing and download history is allowed.

chrome/common/pref_names.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 "chrome/common/pref_names.h"
 
 #include "base/basictypes.h"
 
 namespace prefs {
 
@@ skipping 896 matching lines @@
     "browser.speechinput_censor_results";
 
 // List of speech recognition context names (extensions or websites) for which
 // the tray notification balloon has already been shown.
 const char kSpeechRecognitionTrayNotificationShownContexts[] =
     "browser.speechinput_tray_notification_shown_contexts";
 
 // Boolean controlling whether history saving is disabled.
 const char kSavingBrowserHistoryDisabled[] = "history.saving_disabled";
 
+// Boolean controlling whether deleting browsing and download history is
+// permitted.
+const char kDeletingBrowserHistoryEnabled[] = "history.deleting_enabled";
+
 // Boolean controlling whether SafeSearch is mandatory for Google Web Searches.
 const char kForceSafeSearch[] = "settings.force_safesearch";
 
 #if defined(TOOLKIT_GTK)
 // GTK specific preference on whether we should match the system GTK theme.
 const char kUsesSystemTheme[] = "extensions.theme.use_system";
 #endif
 const char kCurrentThemePackFilename[] = "extensions.theme.pack";
 const char kCurrentThemeID[] = "extensions.theme.id";
 const char kCurrentThemeImages[] = "extensions.theme.images";
@@ skipping 1358 matching lines @@
 const char kRLZDisabled[] = "rlz.disabled";
 #endif
 
 #if defined(ENABLE_APP_LIST)
 // The directory in user data dir that contains the profile to be used with the
 // app launcher.
 extern const char kAppListProfile[] = "app_list.profile";
 #endif
 
 }  // namespace prefs