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

chrome/browser/policy/configuration_policy_handler_list.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/browser/policy/configuration_policy_handler_list.h"
 
 #include <limits>
 
 #include "base/prefs/pref_value_map.h"
 #include "base/stl_util.h"
@@ skipping 88 matching lines @@
     Value::TYPE_LIST },
   { key::kEnabledPlugins,
     prefs::kPluginsEnabledPlugins,
     Value::TYPE_LIST },
   { key::kShowHomeButton,
     prefs::kShowHomeButton,
     Value::TYPE_BOOLEAN },
   { key::kSavingBrowserHistoryDisabled,
     prefs::kSavingBrowserHistoryDisabled,
     Value::TYPE_BOOLEAN },
+  { key::kDeletingBrowserHistoryEnabled,
+    prefs::kDeletingBrowserHistoryEnabled,
+    Value::TYPE_BOOLEAN },
   { key::kDeveloperToolsDisabled,
     prefs::kDevToolsDisabled,
     Value::TYPE_BOOLEAN },
   { key::kBlockThirdPartyCookies,
     prefs::kBlockThirdPartyCookies,
     Value::TYPE_BOOLEAN },
   { key::kDefaultCookiesSetting,
     prefs::kManagedDefaultCookiesSetting,
     Value::TYPE_INTEGER },
   { key::kDefaultImagesSetting,
@@ skipping 397 matching lines @@
 }
 
 void ConfigurationPolicyHandlerList::PrepareForDisplaying(
     PolicyMap* policies) const {
   std::vector<ConfigurationPolicyHandler*>::const_iterator handler;
   for (handler = handlers_.begin(); handler != handlers_.end(); ++handler)
     (*handler)->PrepareForDisplaying(policies);
 }
 
 }  // namespace policy