Gtk3 UI: Rename files in libgtkui containing gtk2 in their name

chrome/browser/ui/libgtkui/print_dialog_gtk.h

 // Copyright 2014 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 CHROME_BROWSER_UI_LIBGTKUI_PRINT_DIALOG_GTK2_H_
-#define CHROME_BROWSER_UI_LIBGTKUI_PRINT_DIALOG_GTK2_H_
+#ifndef CHROME_BROWSER_UI_LIBGTKUI_PRINT_DIALOG_GTK_H_
+#define CHROME_BROWSER_UI_LIBGTKUI_PRINT_DIALOG_GTK_H_
 
 #include <gtk/gtk.h>
 #include <gtk/gtkunixprint.h>
 
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/sequenced_task_runner_helpers.h"
-#include "chrome/browser/ui/libgtkui/gtk2_signal.h"
+#include "chrome/browser/ui/libgtkui/gtk_signal.h"
 #include "content/public/browser/browser_thread.h"
 #include "printing/print_dialog_gtk_interface.h"
 #include "printing/printing_context_linux.h"
 #include "ui/aura/window_observer.h"
 
 namespace printing {
 class MetafilePlayer;
 class PrintSettings;
 }
 
 using printing::PrintingContextLinux;
 
 // Needs to be freed on the UI thread to clean up its GTK members variables.
-class PrintDialogGtk2
-    : public printing::PrintDialogGtkInterface,
-      public base::RefCountedThreadSafe<
-          PrintDialogGtk2, content::BrowserThread::DeleteOnUIThread>,
-      public aura::WindowObserver {
+class PrintDialogGtk2 : public printing::PrintDialogGtkInterface,
+                        public base::RefCountedThreadSafe<
+                            PrintDialogGtk2,
+                            content::BrowserThread::DeleteOnUIThread>,
+                        public aura::WindowObserver {
  public:
   // Creates and returns a print dialog.
   static printing::PrintDialogGtkInterface* CreatePrintDialog(
       PrintingContextLinux* context);
 
   // printing::PrintDialogGtkInterface implementation.
   void UseDefaultSettings() override;
   bool UpdateSettings(printing::PrintSettings* settings) override;
   void ShowDialog(
       gfx::NativeView parent_view,
@@ skipping 37 matching lines @@
   GtkWidget* dialog_;
   GtkPrintSettings* gtk_settings_;
   GtkPageSetup* page_setup_;
   GtkPrinter* printer_;
 
   base::FilePath path_to_pdf_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintDialogGtk2);
 };
 
-#endif  // CHROME_BROWSER_UI_LIBGTKUI_PRINT_DIALOG_GTK2_H_
+#endif  // CHROME_BROWSER_UI_LIBGTKUI_PRINT_DIALOG_GTK_H_