Rename the remaining usage of Monitor to Display

ash/display/secondary_display_view.h

Index: ash/display/secondary_display_view.h
diff --git a/ash/monitor/secondary_monitor_view.h b/ash/display/secondary_display_view.h
similarity index 61%
rename from ash/monitor/secondary_monitor_view.h
rename to ash/display/secondary_display_view.h
index cca03d2f40c73a318aa01ca33501d14a59f9ac5e..60db1e05f9163bdd29a36ff7e43cf67826814d2a 100644
--- a/ash/monitor/secondary_monitor_view.h
+++ b/ash/display/secondary_display_view.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_MONITOR_SECONDARY_MONITOR_VIEW_H_
-#define ASH_MONITOR_SECONDARY_MONITOR_VIEW_H_
+#ifndef ASH_DISPLAY_SECONDARY_DISPLAY_VIEW_H_
+#define ASH_DISPLAY_SECONDARY_DISPLAY_VIEW_H_
 #pragma once
 
 namespace aura {
@@ -17,9 +17,9 @@ class Widget;
 namespace ash {
 
 // Creates the widget that hosts the static message displayed on the
-// secondary monitor.
-views::Widget* CreateSecondaryMonitorWidget(aura::Window* parent);
+// secondary display.
+views::Widget* CreateSecondaryDisplayWidget(aura::Window* parent);
 
 }  // namespace ash
 
-#endif  // ASH_MONITOR_SECONDARY_MONITOR_VIEW_H_
+#endif  // ASH_DISPLAY_SECONDARY_DISPLAY_VIEW_H_