Revert of Use a standard message box for DesktopCastingWarningView.

chrome/browser/ui/views/simple_message_box_views.cc

Index: chrome/browser/ui/views/simple_message_box_views.cc
diff --git a/chrome/browser/ui/views/simple_message_box_views.cc b/chrome/browser/ui/views/simple_message_box_views.cc
index 91c219394eff2a5b098cd8d88d6deecae3c9b67b..4eee13d9bbbd578f364f10bd44db81ef41033ce1 100644
--- a/chrome/browser/ui/views/simple_message_box_views.cc
+++ b/chrome/browser/ui/views/simple_message_box_views.cc
@@ -72,9 +72,6 @@
 
   DISALLOW_COPY_AND_ASSIGN(SimpleMessageBoxViews);
 };
-
-// The currently showing message box, if there is one. Used for tests.
-SimpleMessageBoxViews* g_current_message_box = nullptr;
 
 ////////////////////////////////////////////////////////////////////////////////
 // SimpleMessageBoxViews, public:
@@ -115,7 +112,6 @@
 }
 
 MessageBoxResult SimpleMessageBoxViews::RunDialogAndGetResult() {
-  g_current_message_box = this;
   MessageBoxResult result = MESSAGE_BOX_RESULT_NO;
   result_ = &result;
   // TODO(pkotwicz): Exit message loop when the dialog is closed by some other
@@ -125,7 +121,6 @@
   base::RunLoop run_loop;
   quit_runloop_ = run_loop.QuitClosure();
   run_loop.Run();
-  g_current_message_box = nullptr;
   return result;
 }
 
@@ -252,17 +247,6 @@
 
 }  // namespace
 
-bool CloseMessageBoxForTest(bool accept) {
-  if (!g_current_message_box)
-    return false;
-
-  if (accept)
-    g_current_message_box->Accept();
-  else
-    g_current_message_box->Cancel();
-  return true;
-}
-
 void ShowWarningMessageBox(gfx::NativeWindow parent,
                            const base::string16& title,
                            const base::string16& message) {