Refactor ViewsDelegate singleton

ash/shell/content_client/shell_browser_main_parts.h

Index: ash/shell/content_client/shell_browser_main_parts.h
diff --git a/ash/shell/content_client/shell_browser_main_parts.h b/ash/shell/content_client/shell_browser_main_parts.h
index 89684315c50dd297913f874bc9d1850a028ca004..539354e890eec9923404f537e2c16dc8daeafb2e 100644
--- a/ash/shell/content_client/shell_browser_main_parts.h
+++ b/ash/shell/content_client/shell_browser_main_parts.h
@@ -22,6 +22,10 @@ namespace net {
 class NetLog;
 }
 
+namespace views {
+class ViewsDelegate;
+}
+
 namespace wm {
 class WMState;
 }
@@ -53,6 +57,7 @@ class ShellBrowserMainParts : public content::BrowserMainParts {
  private:
   scoped_ptr<net::NetLog> net_log_;
   scoped_ptr<content::ShellBrowserContext> browser_context_;
+  scoped_ptr<views::ViewsDelegate> views_delegate_;
   scoped_ptr<ash::shell::WindowWatcher> window_watcher_;
   ShellDelegateImpl* delegate_;  // owned by Shell
   scoped_ptr<wm::WMState> wm_state_;