Revert of Add OnDisplayMetricsChanged in DisplayObserver.

ash/display/display_controller.cc

Index: ash/display/display_controller.cc
diff --git a/ash/display/display_controller.cc b/ash/display/display_controller.cc
index 43a6282d4573337473d3830f59f5230be6cccdad..35ae9d3ab5215cad0e37542a7dfa385629754f34 100644
--- a/ash/display/display_controller.cc
+++ b/ash/display/display_controller.cc
@@ -547,6 +547,15 @@
   return GetDisplayManager()->UpdateWorkAreaOfDisplay(id, insets);
 }
 
+void DisplayController::OnDisplayBoundsChanged(const gfx::Display& display) {
+  const DisplayInfo& display_info =
+      GetDisplayManager()->GetDisplayInfo(display.id());
+  DCHECK(!display_info.bounds_in_native().IsEmpty());
+  AshWindowTreeHost* ash_host = window_tree_hosts_[display.id()];
+  ash_host->AsWindowTreeHost()->SetBounds(display_info.bounds_in_native());
+  SetDisplayPropertiesOnHost(ash_host, display);
+}
+
 void DisplayController::OnDisplayAdded(const gfx::Display& display) {
   if (primary_tree_host_for_replace_) {
     DCHECK(window_tree_hosts_.empty());
@@ -601,9 +610,8 @@
     GetRootWindowSettings(GetWindow(primary_host))->display_id =
         primary_display_id;
 
-    OnDisplayMetricsChanged(
-        GetDisplayManager()->GetDisplayForId(primary_display_id),
-        DISPLAY_METRIC_BOUNDS);
+    OnDisplayBoundsChanged(
+        GetDisplayManager()->GetDisplayForId(primary_display_id));
   }
   RootWindowController* controller =
       GetRootWindowController(GetWindow(host_to_delete));
@@ -613,20 +621,6 @@
   // root window itself yet because the stack may be using it.
   controller->Shutdown();
   base::MessageLoop::current()->DeleteSoon(FROM_HERE, controller);
-}
-
-void DisplayController::OnDisplayMetricsChanged(const gfx::Display& display,
-                                                uint32_t metrics) {
-  if (!(metrics & (DISPLAY_METRIC_BOUNDS | DISPLAY_METRIC_ROTATION |
-                   DISPLAY_METRIC_DEVICE_SCALE_FACTOR)))
-    return;
-
-  const DisplayInfo& display_info =
-      GetDisplayManager()->GetDisplayInfo(display.id());
-  DCHECK(!display_info.bounds_in_native().IsEmpty());
-  AshWindowTreeHost* ash_host = window_tree_hosts_[display.id()];
-  ash_host->AsWindowTreeHost()->SetBounds(display_info.bounds_in_native());
-  SetDisplayPropertiesOnHost(ash_host, display);
 }
 
 void DisplayController::OnHostResized(const aura::WindowTreeHost* host) {