Remove ash localization from display_manager.cc

ash/display/window_tree_host_manager.cc

Index: ash/display/window_tree_host_manager.cc
diff --git a/ash/display/window_tree_host_manager.cc b/ash/display/window_tree_host_manager.cc
index f2608eedb836f579cb68e8e75908e22e8e6829d8..c3e97980b4ce512159021ecea85ae6fe0c3484d8 100644
--- a/ash/display/window_tree_host_manager.cc
+++ b/ash/display/window_tree_host_manager.cc
@@ -31,6 +31,7 @@
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
+#include "grit/ash_strings.h"
 #include "ui/aura/client/capture_client.h"
 #include "ui/aura/client/focus_client.h"
 #include "ui/aura/client/screen_position_client.h"
@@ -40,6 +41,7 @@
 #include "ui/aura/window_tracker.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/ime/input_method_factory.h"
+#include "ui/base/l10n/l10n_util.h"
 #include "ui/compositor/compositor.h"
 #include "ui/display/display.h"
 #include "ui/display/manager/display_layout.h"
@@ -802,6 +804,14 @@ ui::DisplayConfigurator* WindowTreeHostManager::display_configurator() {
 }
 #endif
 
+std::string WindowTreeHostManager::GetInternalDisplayNameString() {
+  return l10n_util::GetStringUTF8(IDS_ASH_INTERNAL_DISPLAY_NAME);
+}
+
+std::string WindowTreeHostManager::GetUnknownDisplayNameString() {
+  return l10n_util::GetStringUTF8(IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME);
+}
+
 ui::EventDispatchDetails WindowTreeHostManager::DispatchKeyEventPostIME(
     ui::KeyEvent* event) {
   // Getting the active root window to dispatch the event. This isn't