Add missing views class names

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 120999a322a96c283fe58318c20a967eb00178f1..2bb43316137a601affb3cfc4746737a7dc836353 100644
--- a/ui/views/controls/message_box_view.h
+++ b/ui/views/controls/message_box_view.h
@@ -23,6 +23,9 @@ class Textfield;
 // and Cancel buttons.
 class VIEWS_EXPORT MessageBoxView : public View {
  public:
+  // Internal class name.
+  static const char kViewClassName[];
+
   enum Options {
     NO_OPTIONS = 0,
     // For a message from a web page (not from Chrome's UI), such as script
@@ -82,6 +85,7 @@ class VIEWS_EXPORT MessageBoxView : public View {
       const ViewHierarchyChangedDetails& details) override;
   // Handles Ctrl-C and writes the message in the system clipboard.
   bool AcceleratorPressed(const ui::Accelerator& accelerator) override;
+  const char* GetClassName() const override;
 
  private:
   // Sets up the layout manager and initializes the message labels and prompt