Create ash media delegate earlier during ash shell initialization

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index b125026a023ffa6df99bcc96acd7f8af20541ce2..7cd6cf1fd51470b38bd27feea6d0f1111da3521c 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -806,6 +806,8 @@ Shell::~Shell() {
 }
 
 void Shell::Init(const ShellInitParams& init_params) {
+  wm_shell_->Initialize();
+
   in_mus_ = init_params.in_mus;
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
@@ -1017,8 +1019,6 @@ void Shell::Init(const ShellInitParams& init_params) {
   accessibility_delegate_.reset(
       wm_shell_->delegate()->CreateAccessibilityDelegate());
   new_window_delegate_.reset(wm_shell_->delegate()->CreateNewWindowDelegate());
-  wm_shell_->SetMediaDelegate(
-      base::WrapUnique(wm_shell_->delegate()->CreateMediaDelegate()));
   pointer_watcher_delegate_ =
       wm_shell_->delegate()->CreatePointerWatcherDelegate();