ash: fix multiple stack-use-after-scope issues with GetPrimaryDisplay use.

ash/content/keyboard_overlay/keyboard_overlay_delegate.cc

Index: ash/content/keyboard_overlay/keyboard_overlay_delegate.cc
diff --git a/ash/content/keyboard_overlay/keyboard_overlay_delegate.cc b/ash/content/keyboard_overlay/keyboard_overlay_delegate.cc
index 14af0f50d626e3e2eb882f15b871c666006edac7..bc79aca672bb53bfe9e08d4bc3b1f2cf0fe8ee8c 100644
--- a/ash/content/keyboard_overlay/keyboard_overlay_delegate.cc
+++ b/ash/content/keyboard_overlay/keyboard_overlay_delegate.cc
@@ -78,10 +78,9 @@ views::Widget* KeyboardOverlayDelegate::Show(views::WebDialogView* view) {
   // Show the widget at the bottom of the work area.
   gfx::Size size;
   GetDialogSize(&size);
-  const gfx::Rect& rect =
-      display::Screen::GetScreen()
-          ->GetDisplayNearestWindow(widget_->GetNativeView())
-          .work_area();
+  const gfx::Rect rect = display::Screen::GetScreen()
+                             ->GetDisplayNearestWindow(widget_->GetNativeView())
+                             .work_area();
   gfx::Rect bounds(rect.x() + (rect.width() - size.width()) / 2,
                    rect.y() + (rect.height() - size.height()) / 2, size.width(),
                    size.height());