Extracted MockManifestPermission to its own file

extensions/common/permissions/mock_manifest_permission.cc

+// Copyright 2017 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 "extensions/common/permissions/mock_manifest_permission.h"
+
+#include "base/memory/ptr_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace extensions {
+
+MockManifestPermission::MockManifestPermission(const std::string& name)
+    : name_(name) {}
+
+std::string MockManifestPermission::name() const {
+  return name_;
+}
+
+std::string MockManifestPermission::id() const {
+  return name();
+}
+
+PermissionIDSet MockManifestPermission::GetPermissions() const {
+  return PermissionIDSet();
+}
+
+bool MockManifestPermission::FromValue(const base::Value* value) {
+  return true;
+}
+
+std::unique_ptr<base::Value> MockManifestPermission::ToValue() const {
+  return base::MakeUnique<base::Value>();
+}
+
+ManifestPermission* MockManifestPermission::Diff(
+    const ManifestPermission* rhs) const {
+  const MockManifestPermission* other =
+      static_cast<const MockManifestPermission*>(rhs);
+  EXPECT_EQ(name_, other->name_);
+  return nullptr;
+}
+
+ManifestPermission* MockManifestPermission::Union(
+    const ManifestPermission* rhs) const {
+  const MockManifestPermission* other =
+      static_cast<const MockManifestPermission*>(rhs);
+  EXPECT_EQ(name_, other->name_);
+  return new MockManifestPermission(name_);
+}
+
+ManifestPermission* MockManifestPermission::Intersect(
+    const ManifestPermission* rhs) const {
+  const MockManifestPermission* other =
+      static_cast<const MockManifestPermission*>(rhs);
+  EXPECT_EQ(name_, other->name_);
+  return new MockManifestPermission(name_);
+}
+
+}  // namespace extensions