browser/ui: Remove unused definitions of CloseWebDialog() function.

chrome/browser/ui/views/web_dialog_view.cc

Index: chrome/browser/ui/views/web_dialog_view.cc
diff --git a/chrome/browser/ui/views/web_dialog_view.cc b/chrome/browser/ui/views/web_dialog_view.cc
index 81240a32e86758029bfadec582c376f206d6d63e..9fcc6145bea4165d56e8c7e5da69221fdcada70a 100644
--- a/chrome/browser/ui/views/web_dialog_view.cc
+++ b/chrome/browser/ui/views/web_dialog_view.cc
@@ -44,10 +44,6 @@ gfx::NativeWindow ShowWebDialog(gfx::NativeWindow parent,
   return widget->GetNativeWindow();
 }
 
-void CloseWebDialog(gfx::NativeWindow window) {
-  views::Widget::GetWidgetForNativeWindow(window)->Close();
-}
-
 }  // namespace browser
 
 ////////////////////////////////////////////////////////////////////////////////