Revert "[WebModals] New API for browser-scoped popup management."

apps/app_window.cc

Index: apps/app_window.cc
diff --git a/apps/app_window.cc b/apps/app_window.cc
index eb4f81a2fd7e42a57786a1902ebb162f9f370d46..46ddb12e8037d86087ce06289305b6ec5ffb4581 100644
--- a/apps/app_window.cc
+++ b/apps/app_window.cc
@@ -263,7 +263,6 @@ void AppWindow::Init(const GURL& url,
     content::WebContentsObserver::Observe(web_contents);
   }
   app_delegate_->InitWebContents(web_contents);
-
   WebContentsModalDialogManager::CreateForWebContents(web_contents);
   // TODO(jamescook): Delegate out this creation.
   extensions::ChromeExtensionWebContentsObserver::CreateForWebContents(
@@ -293,10 +292,6 @@ void AppWindow::Init(const GURL& url,
   helper_.reset(new AppWebContentsHelper(
       browser_context_, extension_id_, web_contents, app_delegate_.get()));
 
-  popup_manager_.reset(
-      new web_modal::PopupManager(GetWebContentsModalDialogHost()));
-  popup_manager_->RegisterWith(web_contents);
-
   // Prevent the browser process from shutting down while this window exists.
   apps_client->IncrementKeepAliveCount();
   UpdateExtensionAppIcon();