Make DisplayInfoProvider an interface

chrome/browser/extensions/display_info_provider_aura.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 "chrome/browser/extensions/display_info_provider_aura.h"
+
+namespace extensions {
+
+DisplayInfoProviderAura::DisplayInfoProviderAura() {
+}
+
+DisplayInfoProviderAura::~DisplayInfoProviderAura() {
+}
+
+bool DisplayInfoProviderAura::SetInfo(
+    const std::string& display_id,
+    const api::system_display::DisplayProperties& info,
+    std::string* error) {
+  *error = "Not implemented";
+  return false;
+}
+
+void DisplayInfoProviderAura::UpdateDisplayUnitInfoForPlatform(
+    const gfx::Display& display,
+    extensions::api::system_display::DisplayUnitInfo* unit) {
+  NOTIMPLEMENTED();
+}
+
+// static
+DisplayInfoProvider* DisplayInfoProvider::Create() {
+  return new DisplayInfoProviderAura();
+}
+
+}  // namespace extensions