Changed AppListDialogContentsView to extend DialogDelegate

Originally, AppListDialogContentsView extended WidgetDelegate directly,
and was not being detected as a dialog correctly on some platforms.
Updated AppListDialogContentsView to now be a DialogDelegate.

BUG=388637

Review URL: https://codereview.chromium.org/405873003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284648 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/views/app_list/app_list_dialog_contents_view.cc

@@ -154,10 +154,6 @@ ui::ModalType AppListDialogContentsView::GetModalType() const {
   return ui::MODAL_TYPE_WINDOW;
 }
 
-ui::AXRole AppListDialogContentsView::GetAccessibleWindowRole() const {
-  return ui::AX_ROLE_DIALOG;
-}
-
 void AppListDialogContentsView::WindowClosing() {
   app_list_controller_delegate_->OnCloseChildDialog();
 }

chrome/browser/ui/views/app_list/app_list_dialog_contents_view.h

@@ -6,7 +6,7 @@
 #define CHROME_BROWSER_UI_VIEWS_APP_LIST_APP_LIST_DIALOG_CONTENTS_VIEW_H_
 
 #include "ui/views/controls/button/button.h"
-#include "ui/views/widget/widget_delegate.h"
+#include "ui/views/window/dialog_delegate.h"
 
 class AppListControllerDelegate;
 
@@ -17,7 +17,7 @@ class Widget;
 
 // The contents view for an App List Dialog, which covers the entire app list
 // and adds a close button.
-class AppListDialogContentsView : public views::WidgetDelegateView,
+class AppListDialogContentsView : public views::DialogDelegateView,
                                   public views::ButtonListener {
  public:
   AppListDialogContentsView(
@@ -48,7 +48,6 @@ class AppListDialogContentsView : public views::WidgetDelegateView,
  protected:
   // Overridden from views::WidgetDelegate:
   virtual ui::ModalType GetModalType() const OVERRIDE;
-  virtual ui::AXRole GetAccessibleWindowRole() const OVERRIDE;
   virtual void WindowClosing() OVERRIDE;
 
  private: