views: Add a new ctor to MessageBoxView that takes only a InitParams.

ui/views/controls/message_box_view.cc

Index: ui/views/controls/message_box_view.cc
diff --git a/ui/views/controls/message_box_view.cc b/ui/views/controls/message_box_view.cc
index affe912912c9271542bb1a1695491dc32c037f5d..3f9bc6e3480ca8dee6effc6e5daa4466c017d727 100644
--- a/ui/views/controls/message_box_view.cc
+++ b/ui/views/controls/message_box_view.cc
@@ -96,24 +96,32 @@ namespace views {
 ///////////////////////////////////////////////////////////////////////////////
 // MessageBoxView, public:
 
+MessageBoxView::MessageBoxView(const string16& message)
+    : prompt_field_(NULL),
+      icon_(NULL),
+      checkbox_(NULL),
+      message_width_(kDefaultMessageWidth) {
+  Init(NO_OPTIONS, message, string16());
+}
+
 MessageBoxView::MessageBoxView(int options,
                                const string16& message,
-                               const string16& default_prompt,
-                               int message_width)
+                               const string16& default_prompt)
     : prompt_field_(NULL),
       icon_(NULL),
       checkbox_(NULL),
-      message_width_(message_width) {
+      message_width_(kDefaultMessageWidth) {
   Init(options, message, default_prompt);
 }
 
 MessageBoxView::MessageBoxView(int options,
                                const string16& message,
-                               const string16& default_prompt)
+                               const string16& default_prompt,
+                               int message_width)
     : prompt_field_(NULL),
       icon_(NULL),
       checkbox_(NULL),
-      message_width_(kDefaultMessageWidth) {
+      message_width_(message_width) {
   Init(options, message, default_prompt);
 }