Move the PolicyDomain and PolicyNamespace types to the policy component.

components/policy/core/common/policy_namespace.cc

+// Copyright 2013 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_namespace.h"
+
+namespace policy {
+
+PolicyNamespace::PolicyNamespace() {}
+
+PolicyNamespace::PolicyNamespace(PolicyDomain domain,
+                                 const std::string& component_id)
+    : domain(domain),
+      component_id(component_id) {}
+
+PolicyNamespace::PolicyNamespace(const PolicyNamespace& other)
+    : domain(other.domain),
+      component_id(other.component_id) {}
+
+PolicyNamespace::~PolicyNamespace() {}
+
+PolicyNamespace& PolicyNamespace::operator=(const PolicyNamespace& other) {
+  domain = other.domain;
+  component_id = other.component_id;
+  return *this;
+}
+
+bool PolicyNamespace::operator<(const PolicyNamespace& other) const {
+  return domain < other.domain ||
+         (domain == other.domain && component_id < other.component_id);
+}
+
+bool PolicyNamespace::operator==(const PolicyNamespace& other) const {
+  return domain == other.domain && component_id == other.component_id;
+}
+
+bool PolicyNamespace::operator!=(const PolicyNamespace& other) const {
+  return !(*this == other);
+}
+
+}  // namespace policy