Using PolicyServiceWatcher instead of PolicyWatcherLinux/Win/Mac.

components/policy/core/common/policy_loader_mac.h

Index: components/policy/core/common/policy_loader_mac.h
diff --git a/components/policy/core/common/policy_loader_mac.h b/components/policy/core/common/policy_loader_mac.h
index b7471e80f09cbbb1f31dfcffc53fa6021579340f..4a51544ee9a123a6f798720d3a72d9db42c12de4 100644
--- a/components/policy/core/common/policy_loader_mac.h
+++ b/components/policy/core/common/policy_loader_mac.h
@@ -33,6 +33,14 @@ class POLICY_EXPORT PolicyLoaderMac : public AsyncPolicyLoader {
   PolicyLoaderMac(scoped_refptr<base::SequencedTaskRunner> task_runner,
                   const base::FilePath& managed_policy_path,
                   MacPreferences* preferences);
+
+  // |application_id| will be passed into Mac's Preference Utilities API
+  // instead of the default value of kCFPreferencesCurrentApplication.
+  PolicyLoaderMac(scoped_refptr<base::SequencedTaskRunner> task_runner,
+                  const base::FilePath& managed_policy_path,
+                  MacPreferences* preferences,
+                  CFStringRef application_id);
+
   ~PolicyLoaderMac() override;
 
   // AsyncPolicyLoader implementation.
@@ -66,6 +74,9 @@ class POLICY_EXPORT PolicyLoaderMac : public AsyncPolicyLoader {
   // Watches for events on the |managed_policy_path_|.
   base::FilePathWatcher watcher_;
 
+  // Application ID to pass into Mac's Preference Utilities API.
+  CFStringRef application_id_;
+
   DISALLOW_COPY_AND_ASSIGN(PolicyLoaderMac);
 };