Delete the GTK+ port of Chrome.

chrome/browser/extensions/api/system_display/display_info_provider_gtk.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/api/system_display/display_info_provider.h"
-
-#include <gdk/gdk.h>
-
-#include "ui/gfx/display.h"
-#include "ui/gfx/screen.h"
-
-namespace extensions {
-
-bool DisplayInfoProvider::SetInfo(const std::string& display_id,
-    const api::system_display::DisplayProperties& info,
-    std::string* error) {
-  *error = "Not Implemented";
-  return false;
-}
-
-void DisplayInfoProvider::UpdateDisplayUnitInfoForPlatform(
-    const gfx::Display& display,
-    extensions::api::system_display::DisplayUnitInfo* unit) {
-  // TODO(Haojian): determine the DPI of the display
-  GdkScreen* screen = gdk_screen_get_default();
-  // The |id| in Display for GTK is the monitor index.
-  gint monitor_num = static_cast<gint>(display.id());
-  char* monitor_name = reinterpret_cast<char*>(gdk_screen_get_monitor_plug_name(
-       screen, monitor_num));
-  if (monitor_name)
-    unit->name = std::string(monitor_name);
-}
-
-}  // namespace extensions