Remove DialogDelegate::UseNewStyle and unused code.

ui/views/window/dialog_delegate.cc

Index: ui/views/window/dialog_delegate.cc
diff --git a/ui/views/window/dialog_delegate.cc b/ui/views/window/dialog_delegate.cc
index b498e9e8692cd09776da6c45757b0c4cde7e75e8..cb5374acf5540c9adf8f1bc38b413022019f7507 100644
--- a/ui/views/window/dialog_delegate.cc
+++ b/ui/views/window/dialog_delegate.cc
@@ -27,11 +27,6 @@ DialogDelegate::~DialogDelegate() {
 }
 
 // static
-bool DialogDelegate::UseNewStyle() {
-  return true;
-}
-
-// static
 Widget* DialogDelegate::CreateDialogWidget(DialogDelegate* dialog,
                                            gfx::NativeWindow context,
                                            gfx::NativeWindow parent) {
@@ -153,17 +148,17 @@ ClientView* DialogDelegate::CreateClientView(Widget* widget) {
 
 NonClientFrameView* DialogDelegate::CreateNonClientFrameView(Widget* widget) {
   if (UseNewStyleForThisDialog())
-    return CreateNewStyleFrameView(widget);
+    return CreateDialogFrameView(widget);
   return WidgetDelegate::CreateNonClientFrameView(widget);
 }
 
 // static
-NonClientFrameView* DialogDelegate::CreateNewStyleFrameView(Widget* widget) {
-  return CreateNewStyleFrameView(widget, false);
+NonClientFrameView* DialogDelegate::CreateDialogFrameView(Widget* widget) {
+  return CreateDialogFrameView(widget, false);
 }
 
 // static
-NonClientFrameView* DialogDelegate::CreateNewStyleFrameView(
+NonClientFrameView* DialogDelegate::CreateDialogFrameView(
     Widget* widget,
     bool force_opaque_border) {
   BubbleFrameView* frame = new BubbleFrameView(gfx::Insets());
@@ -195,7 +190,7 @@ NonClientFrameView* DialogDelegate::CreateNewStyleFrameView(
 }
 
 bool DialogDelegate::UseNewStyleForThisDialog() const {
-  return UseNewStyle();
+  return true;
 }
 
 const DialogClientView* DialogDelegate::GetDialogClientView() const {