Have OobeUI handle display observation

chrome/browser/chromeos/login/ui/login_display_host_impl.cc

Index: chrome/browser/chromeos/login/ui/login_display_host_impl.cc
diff --git a/chrome/browser/chromeos/login/ui/login_display_host_impl.cc b/chrome/browser/chromeos/login/ui/login_display_host_impl.cc
index 6db2b1af8b0e70bb4d47adbe482ba8dd6dcb53d3..12422f23939f1b1cbcbca21d8d476f5026910618 100644
--- a/chrome/browser/chromeos/login/ui/login_display_host_impl.cc
+++ b/chrome/browser/chromeos/login/ui/login_display_host_impl.cc
@@ -97,8 +97,6 @@
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
-#include "ui/display/display.h"
-#include "ui/display/screen.h"
 #include "ui/events/event_handler.h"
 #include "ui/events/event_utils.h"
 #include "ui/gfx/geometry/rect.h"
@@ -372,7 +370,6 @@ LoginDisplayHostImpl::LoginDisplayHostImpl(const gfx::Rect& wallpaper_bounds)
   DBusThreadManager::Get()->GetSessionManagerClient()->AddObserver(this);
   CrasAudioHandler::Get()->AddAudioObserver(this);
 
-  display::Screen::GetScreen()->AddObserver(this);
 
   // We need to listen to CLOSE_ALL_BROWSERS_REQUEST but not APP_TERMINATING
   // because/ APP_TERMINATING will never be fired as long as this keeps
@@ -482,7 +479,6 @@ LoginDisplayHostImpl::LoginDisplayHostImpl(const gfx::Rect& wallpaper_bounds)
 LoginDisplayHostImpl::~LoginDisplayHostImpl() {
   DBusThreadManager::Get()->GetSessionManagerClient()->RemoveObserver(this);
   CrasAudioHandler::Get()->RemoveAudioObserver(this);
-  display::Screen::GetScreen()->RemoveObserver(this);
 
   if (login_view_ && login_window_)
     login_window_->RemoveRemovalsObserver(this);
@@ -972,32 +968,6 @@ void LoginDisplayHostImpl::OnActiveOutputNodeChanged() {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-// LoginDisplayHostImpl, display::DisplayObserver:
-
-void LoginDisplayHostImpl::OnDisplayAdded(const display::Display& new_display) {
-}
-
-void LoginDisplayHostImpl::OnDisplayRemoved(
-    const display::Display& old_display) {}
-
-void LoginDisplayHostImpl::OnDisplayMetricsChanged(
-    const display::Display& display,
-    uint32_t changed_metrics) {
-  display::Display primary_display =
-      display::Screen::GetScreen()->GetPrimaryDisplay();
-  if (display.id() != primary_display.id() ||
-      !(changed_metrics & DISPLAY_METRIC_BOUNDS)) {
-    return;
-  }
-
-  if (GetOobeUI()) {
-    const gfx::Size& size = primary_display.size();
-    GetOobeUI()->GetCoreOobeView()->SetClientAreaSize(size.width(),
-                                                      size.height());
-  }
-}
-
-////////////////////////////////////////////////////////////////////////////////
 // LoginDisplayHostImpl, views::WidgetRemovalsObserver:
 void LoginDisplayHostImpl::OnWillRemoveView(views::Widget* widget,
                                             views::View* view) {