Removes WmRootWindowController::GetShell()

ash/aura/wm_root_window_controller_aura.cc

Index: ash/aura/wm_root_window_controller_aura.cc
diff --git a/ash/aura/wm_root_window_controller_aura.cc b/ash/aura/wm_root_window_controller_aura.cc
index 368f3ca76bdd719c7f5fe601f46ef9b41c09d153..21964424a5dc01decd82cd9c7d7bb716bc8de349 100644
--- a/ash/aura/wm_root_window_controller_aura.cc
+++ b/ash/aura/wm_root_window_controller_aura.cc
@@ -4,7 +4,6 @@
 
 #include "ash/aura/wm_root_window_controller_aura.h"
 
-#include "ash/aura/wm_shell_aura.h"
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/shelf/shelf_widget.h"
 #include "ash/common/shelf/wm_shelf.h"
@@ -61,10 +60,6 @@ bool WmRootWindowControllerAura::HasShelf() {
   return root_window_controller_->wm_shelf()->shelf_widget() != nullptr;
 }
 
-WmShell* WmRootWindowControllerAura::GetShell() {
-  return WmShell::Get();
-}
-
 WmShelf* WmRootWindowControllerAura::GetShelf() {
   return root_window_controller_->wm_shelf();
 }