Rework the way Widget::Init works:

chrome/browser/chromeos/login/message_bubble.cc

Index: chrome/browser/chromeos/login/message_bubble.cc
===================================================================
--- chrome/browser/chromeos/login/message_bubble.cc	(revision 83020)
+++ chrome/browser/chromeos/login/message_bubble.cc	(working copy)
@@ -21,7 +21,7 @@
 static const int kBorderSize = 4;
 static const int kMaxLabelWidth = 250;
 
-MessageBubble::MessageBubble(views::WidgetGtk::Type type,
+MessageBubble::MessageBubble(views::Widget::CreateParams::Type type,
                              views::Widget* parent,
                              SkBitmap* image,
                              const std::wstring& text,
@@ -114,7 +114,8 @@
                                    MessageBubbleDelegate* delegate) {
   // The bubble will be destroyed when it is closed.
   MessageBubble* bubble = new MessageBubble(
-      views::WidgetGtk::TYPE_WINDOW, parent, image, text, help, true, delegate);
+      views::Widget::CreateParams::TYPE_WINDOW, parent, image, text, help,
+      true, delegate);
   bubble->InitBubble(parent, position_relative_to, arrow_location,
                      bubble->text_->parent(), delegate);
   return bubble;
@@ -131,7 +132,8 @@
     MessageBubbleDelegate* delegate) {
   // The bubble will be destroyed when it is closed.
   MessageBubble* bubble = new MessageBubble(
-      views::WidgetGtk::TYPE_CHILD, parent, image, text, help, false, delegate);
+      views::Widget::CreateParams::TYPE_CONTROL, parent, image, text, help,
+      false, delegate);
   bubble->InitBubble(parent, position_relative_to, arrow_location,
                      bubble->text_->parent(), delegate);
   return bubble;