Revert of Add OnDisplayMetricsChanged in DisplayObserver.

media/video/capture/linux/video_capture_device_chromeos.cc

Index: media/video/capture/linux/video_capture_device_chromeos.cc
diff --git a/media/video/capture/linux/video_capture_device_chromeos.cc b/media/video/capture/linux/video_capture_device_chromeos.cc
index fd213e0a744103affe2ebb42885f755960764a93..40e6eaacfd6204f66f71771808353017558c1281 100644
--- a/media/video/capture/linux/video_capture_device_chromeos.cc
+++ b/media/video/capture/linux/video_capture_device_chromeos.cc
@@ -45,14 +45,13 @@
     DCHECK(!capture_device_);
   }
 
+  // gfx::DisplayObserver:
+  virtual void OnDisplayBoundsChanged(const gfx::Display& display) OVERRIDE {
+    SendDisplayRotation(display);
+  }
+
   virtual void OnDisplayAdded(const gfx::Display& /*new_display*/) OVERRIDE {}
   virtual void OnDisplayRemoved(const gfx::Display& /*old_display*/) OVERRIDE {}
-  virtual void OnDisplayMetricsChanged(const gfx::Display& display,
-                                       uint32_t metrics) OVERRIDE {
-    if (!(metrics & DISPLAY_METRIC_ROTATION))
-      return;
-    SendDisplayRotation(display);
-  }
 
   void AddObserverOnUIThread() {
     DCHECK(ui_task_runner_->BelongsToCurrentThread());