Put alert dialog text in a scroll view.

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 cb708e6013d9f7960a108e7ec09dba38dfe67aab..ce233ff0da679645779c610b05bf4e6e027af05b 100644
--- a/ui/views/controls/message_box_view.h
+++ b/ui/views/controls/message_box_view.h
@@ -66,10 +66,6 @@ class VIEWS_EXPORT MessageBoxView : public View {
   // the message box has no checkbox.)
   bool IsCheckBoxSelected();
 
-  // Adds |icon| to the upper left of the message box or replaces the current
-  // icon. To start out, the message box has no icon.
-  void SetIcon(const gfx::ImageSkia& icon);
-
   // Adds a checkbox with the specified label to the message box if this is the
   // first call. Otherwise, it changes the label of the current checkbox. To
   // start, the message box has no checkbox until this function is called.
@@ -107,9 +103,6 @@ class VIEWS_EXPORT MessageBoxView : public View {
   // Input text field for the message box.
   Textfield* prompt_field_;
 
-  // Icon displayed in the upper left corner of the message box.
-  ImageView* icon_;
-
   // Checkbox for the message box.
   Checkbox* checkbox_;