Rework the way Widget::Init works:

views/widget/native_widget.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef VIEWS_WIDGET_NATIVE_WIDGET_H_
 #define VIEWS_WIDGET_NATIVE_WIDGET_H_
 #pragma once
 
 #include <set>
 
@@ skipping 40 matching lines @@
   // Returns all NativeWidgets in |native_view|'s hierarchy, including itself if
   // it is one.
   static void GetAllNativeWidgets(gfx::NativeView native_view,
                                   NativeWidgets* children);
 
   // Reparent a NativeView and notify all NativeWidgets in
   // |native_view|'s hierarchy of the change.
   static void ReparentNativeView(gfx::NativeView native_view,
                                  gfx::NativeView new_parent);
 
-  // Sets the create params for the NativeWidget.
-  virtual void SetCreateParams(const Widget::CreateParams& params) = 0;
+  // Initializes the NativeWidget.
+  virtual void InitNativeWidget(const Widget::CreateParams& params) = 0;
 
   // Returns the Widget associated with this NativeWidget. This function is
   // guaranteed to return non-NULL for the lifetime of the NativeWidget.
   virtual Widget* GetWidget() = 0;
 
   // Sets/Gets a native window property on the underlying native window object.
   // Returns NULL if the property does not exist. Setting the property value to
   // NULL removes the property.
   virtual void SetNativeWindowProperty(const char* name, void* value) = 0;
   virtual void* GetNativeWindowProperty(const char* name) = 0;
@@ skipping 51 matching lines @@
   virtual void RunShellDrag(View* view,
                             const ui::OSExchangeData& data,
                             int operation) = 0;
   virtual void SchedulePaintInRect(const gfx::Rect& rect) = 0;
   virtual void SetCursor(gfx::NativeCursor cursor) = 0;
 };
 
 }  // namespace views
 
 #endif  // VIEWS_WIDGET_NATIVE_WIDGET_H_