Decouple EventClientImpl and root window. Check containers on the same root window as focused windo…

ash/root_window_controller.cc

Index: ash/root_window_controller.cc
diff --git a/ash/root_window_controller.cc b/ash/root_window_controller.cc
index 1f08095c117800193937ac9eb91515f6791486ac..b0a5b92bbb86e63cdfc1ff4fedf69b634a050f1a 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -13,7 +13,6 @@
 #include "ash/shell_factory.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/base_layout_manager.h"
-#include "ash/wm/event_client_impl.h"
 #include "ash/wm/property_util.h"
 #include "ash/wm/root_window_layout_manager.h"
 #include "ash/wm/screen_dimmer.h"
@@ -144,8 +143,6 @@ namespace internal {
 RootWindowController::RootWindowController(aura::RootWindow* root_window)
     : root_window_(root_window) {
   SetRootWindowController(root_window, this);
-
-  event_client_.reset(new EventClientImpl(root_window));
   screen_dimmer_.reset(new ScreenDimmer(root_window));
 }
 
@@ -162,7 +159,6 @@ void RootWindowController::Shutdown() {
         NULL : Shell::GetPrimaryRootWindow());
   }
   SetRootWindowController(root_window_.get(), NULL);
-  event_client_.reset();
   screen_dimmer_.reset();
   workspace_controller_.reset();
   // Forget with the display ID so that display lookup