fix GridLayout::CreatePanel for new style dialogs

ui/views/controls/message_box_view.h

Index: ui/views/controls/message_box_view.h
diff --git a/ui/views/controls/message_box_view.h b/ui/views/controls/message_box_view.h
index 0ad04c6f4030b0a5f84693d47ed7866e2f5aa22c..6c7940ea0ba794ca5a0392660ab0f8f3e600fb97 100644
--- a/ui/views/controls/message_box_view.h
+++ b/ui/views/controls/message_box_view.h
@@ -48,10 +48,6 @@ class VIEWS_EXPORT MessageBoxView : public View {
     string16 message;
     string16 default_prompt;
     int message_width;
-    int top_inset;
-    int bottom_inset;
-    int left_inset;
-    int right_inset;
     int inter_row_vertical_spacing;
     ui::Clipboard::SourceTag clipboard_source_tag;
   };
@@ -117,12 +113,6 @@ class VIEWS_EXPORT MessageBoxView : public View {
   // Maximum width of the message label.
   int message_width_;
 
-  // Insets for the grid layout.
-  int top_inset_;
-  int bottom_inset_;
-  int left_inset_;
-  int right_inset_;
-
   // Spacing between rows in the grid layout.
   int inter_row_vertical_spacing_;