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

components/policy/core/common/policy_loader_mac.mm

Index: components/policy/core/common/policy_loader_mac.mm
diff --git a/components/policy/core/common/policy_loader_mac.mm b/components/policy/core/common/policy_loader_mac.mm
index 195bcf36c76f3bc62375ef7a32629bb53113276b..94e8ebc6ea9a030ffc1ebd9fffe353026144f5ea 100644
--- a/components/policy/core/common/policy_loader_mac.mm
+++ b/components/policy/core/common/policy_loader_mac.mm
@@ -4,6 +4,8 @@
 
 #include "components/policy/core/common/policy_loader_mac.h"
 
+#include <utility>
+
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
@@ -78,7 +80,7 @@ std::unique_ptr<PolicyBundle> PolicyLoaderMac::Load() {
         base::SysUTF8ToCFStringRef(it.key()));
     base::ScopedCFTypeRef<CFPropertyListRef> value(
         preferences_->CopyAppValue(name, application_id_));
-    if (!value.get())
+    if (!value)
       continue;
     policy_present = true;
     bool forced = preferences_->AppValueIsForced(name, application_id_);
@@ -88,7 +90,7 @@ std::unique_ptr<PolicyBundle> PolicyLoaderMac::Load() {
     std::unique_ptr<base::Value> policy = PropertyToValue(value);
     if (policy) {
       chrome_policy.Set(it.key(), level, POLICY_SCOPE_USER,
-                        POLICY_SOURCE_PLATFORM, policy.release(), nullptr);
+                        POLICY_SOURCE_PLATFORM, std::move(policy), nullptr);
     } else {
       status.Add(POLICY_LOAD_STATUS_PARSE_ERROR);
     }
@@ -174,7 +176,7 @@ void PolicyLoaderMac::LoadPolicyForComponent(
         base::SysUTF8ToCFStringRef(it.key()));
     base::ScopedCFTypeRef<CFPropertyListRef> value(
         preferences_->CopyAppValue(pref_name, bundle_id));
-    if (!value.get())
+    if (!value)
       continue;
     bool forced = preferences_->AppValueIsForced(pref_name, bundle_id);
     PolicyLevel level =
@@ -182,7 +184,7 @@ void PolicyLoaderMac::LoadPolicyForComponent(
     std::unique_ptr<base::Value> policy_value = PropertyToValue(value);
     if (policy_value) {
       policy->Set(it.key(), level, POLICY_SCOPE_USER, POLICY_SOURCE_PLATFORM,
-                  policy_value.release(), nullptr);
+                  std::move(policy_value), nullptr);
     }
   }
 }