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

chrome/browser/ui/libgtkui/native_theme_gtk.h

Index: chrome/browser/ui/libgtkui/native_theme_gtk.h
diff --git a/chrome/browser/ui/libgtkui/native_theme_gtk2.h b/chrome/browser/ui/libgtkui/native_theme_gtk.h
similarity index 90%
rename from chrome/browser/ui/libgtkui/native_theme_gtk2.h
rename to chrome/browser/ui/libgtkui/native_theme_gtk.h
index a5e7b2b8fe6e8af7dff405927890787348db60e9..18747ec7ce38d1d91ac34262bd1bc66f8774a40a 100644
--- a/chrome/browser/ui/libgtkui/native_theme_gtk2.h
+++ b/chrome/browser/ui/libgtkui/native_theme_gtk.h
@@ -2,15 +2,14 @@
 // 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_NATIVE_THEME_GTK2_H_
-#define CHROME_BROWSER_UI_LIBGTKUI_NATIVE_THEME_GTK2_H_
+#ifndef CHROME_BROWSER_UI_LIBGTKUI_NATIVE_THEME_GTK_H_
+#define CHROME_BROWSER_UI_LIBGTKUI_NATIVE_THEME_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include "base/macros.h"
 #include "ui/native_theme/native_theme_base.h"
 
-
 namespace libgtkui {
 
 // A version of NativeTheme that uses GTK2 supplied colours instead of the
@@ -57,4 +56,4 @@ class NativeThemeGtk2 : public ui::NativeThemeBase {
 
 }  // namespace libgtkui
 
-#endif  // CHROME_BROWSER_UI_LIBGTKUI_NATIVE_THEME_GTK2_H_
+#endif  // CHROME_BROWSER_UI_LIBGTKUI_NATIVE_THEME_GTK_H_