Revert 85666 - Consolidate ShouldUseNativeFrame/AlwaysUseNativeFrame/UseNativeFrame spaghetti.

views/window/native_window_delegate.h

Index: views/window/native_window_delegate.h
===================================================================
--- views/window/native_window_delegate.h	(revision 85701)
+++ views/window/native_window_delegate.h	(working copy)
@@ -35,6 +35,10 @@
   // Returns true if the window is a dialog box.
   virtual bool IsDialogBox() const = 0;
 
+  // Returns true if the window is using a system native frame. Returns false if
+  // it is rendering its own title bar, borders and controls.
+  virtual bool IsUsingNativeFrame() const = 0;
+
   // Returns the smallest size the window can be resized to by the user.
   virtual gfx::Size GetMinimumSize() const = 0;