views: Moves TextfieldController/TextRange into their own headers.

views/controls/textfield/native_textfield_gtk.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_CONTROLS_TEXTFIELD_NATIVE_TEXTFIELD_GTK_H_
 #define VIEWS_CONTROLS_TEXTFIELD_NATIVE_TEXTFIELD_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
 #include "base/string16.h"
 #include "views/controls/native_control_gtk.h"
 #include "views/controls/textfield/native_textfield_wrapper.h"
 
 namespace views {
 
+class TextRange;
+
 class NativeTextfieldGtk : public NativeControlGtk,
                            public NativeTextfieldWrapper {
  public:
   explicit NativeTextfieldGtk(Textfield* parent);
   ~NativeTextfieldGtk();
 
   // Returns the textfield this NativeTextfieldGtk wraps.
   Textfield* textfield() const { return textfield_; }
 
   // Returns the inner border of the entry.
@@ skipping 53 matching lines @@
       GtkWidget* entry,
       NativeTextfieldGtk* textfield);
   gboolean OnChanged();
 
   DISALLOW_COPY_AND_ASSIGN(NativeTextfieldGtk);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_TEXTFIELD_NATIVE_TEXTFIELD_GTK_H_