Use std::unique_ptr to express ownership of base::Value in PolicyMap::Entry

components/policy/core/common/policy_loader_win.cc

 // Copyright (c) 2014 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 "components/policy/core/common/policy_loader_win.h"
 
 #include <windows.h>
 #include <lm.h>       // For limits.
 #include <ntdsapi.h>  // For Ds[Un]Bind
 #include <rpc.h>      // For struct GUID
@@ skipping 130 matching lines @@
 
   int invalid_policies = 0;
   const PolicyMap::Entry* map_entry =
       policy->Get(key::kExtensionInstallForcelist);
   if (map_entry && map_entry->value) {
     const base::ListValue* policy_list_value = NULL;
     if (!map_entry->value->GetAsList(&policy_list_value))
       return;
 
     std::unique_ptr<base::ListValue> filtered_values(new base::ListValue);
-    for (base::ListValue::const_iterator list_entry(policy_list_value->begin());
-         list_entry != policy_list_value->end(); ++list_entry) {
+    for (const auto& list_entry : *policy_list_value) {
       std::string entry;
-      if (!(*list_entry)->GetAsString(&entry))
+      if (!list_entry->GetAsString(&entry))
         continue;
       size_t pos = entry.find(';');
       if (pos == std::string::npos)
         continue;
       // Only allow custom update urls in enterprise environments.
       if (!base::LowerCaseEqualsASCII(entry.substr(pos),
                                       kExpectedWebStoreUrl)) {
         entry = kBlockedExtensionPrefix + entry;
         invalid_policies++;
       }
 
       filtered_values->AppendString(entry);
     }
     if (invalid_policies) {
-      policy->Set(key::kExtensionInstallForcelist,
-                  map_entry->level, map_entry->scope, map_entry->source,
-                  filtered_values.release(),
-                  map_entry->external_data_fetcher);
+      PolicyMap::Entry filtered_entry = map_entry->DeepCopy();
+      filtered_entry.value = std::move(filtered_values);
+      policy->Set(key::kExtensionInstallForcelist, std::move(filtered_entry));
 
       const PolicyDetails* details = GetChromePolicyDetails(
           key::kExtensionInstallForcelist);
       UMA_HISTOGRAM_SPARSE_SLOWLY("EnterpriseCheck.InvalidPolicies",
                                   details->id);
     }
   }
 
   for (size_t i = 0; i < arraysize(kInsecurePolicies); ++i) {
     if (policy->Get(kInsecurePolicies[i])) {
@@ skipping 500 matching lines @@
 
 void PolicyLoaderWin::OnObjectSignaled(HANDLE object) {
   DCHECK(object == user_policy_changed_event_.handle() ||
          object == machine_policy_changed_event_.handle())
       << "unexpected object signaled policy reload, obj = "
       << std::showbase << std::hex << object;
   Reload(false);
 }
 
 }  // namespace policy