Revert of Add OnDisplayMetricsChanged in DisplayObserver.

ui/views/widget/desktop_aura/desktop_screen_x11.cc

Index: ui/views/widget/desktop_aura/desktop_screen_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_screen_x11.cc b/ui/views/widget/desktop_aura/desktop_screen_x11.cc
index fef23aa5ed0d81c1e153915294eaf59c87a5c415..d9277807d443470b824144ab0ff48af2ccfcadfe 100644
--- a/ui/views/widget/desktop_aura/desktop_screen_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_screen_x11.cc
@@ -137,31 +137,15 @@
     bool found = false;
     for (std::vector<gfx::Display>::const_iterator old_it =
          old_displays.begin(); old_it != old_displays.end(); ++old_it) {
-      if (new_it->id() != old_it->id())
-        continue;
-
-      uint32_t metrics = gfx::DisplayObserver::DISPLAY_METRIC_NONE;
-
-      if (new_it->bounds() != old_it->bounds())
-        metrics |= gfx::DisplayObserver::DISPLAY_METRIC_BOUNDS;
-
-      if (new_it->rotation() != old_it->rotation())
-        metrics |= gfx::DisplayObserver::DISPLAY_METRIC_ROTATION;
-
-      if (new_it->work_area() != old_it->work_area())
-        metrics |= gfx::DisplayObserver::DISPLAY_METRIC_WORK_AREA;
-
-      if (new_it->device_scale_factor() != old_it->device_scale_factor())
-        metrics |= gfx::DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
-
-      if (metrics != gfx::DisplayObserver::DISPLAY_METRIC_NONE) {
-        FOR_EACH_OBSERVER(gfx::DisplayObserver,
-                          observer_list_,
-                          OnDisplayMetricsChanged(*new_it, metrics));
-      }
-
-      found = true;
-      break;
+      if (new_it->id() == old_it->id()) {
+        if (new_it->bounds() != old_it->bounds()) {
+          FOR_EACH_OBSERVER(gfx::DisplayObserver, observer_list_,
+                            OnDisplayBoundsChanged(*new_it));
+        }
+
+        found = true;
+        break;
+      }
     }
 
     if (!found) {