LibGtkUi: Partition NativeThemeGtk into NativeThemeGtk2 and NativeThemeGtk3

chrome/browser/ui/libgtkui/native_theme_gtk2.h

Index: chrome/browser/ui/libgtkui/native_theme_gtk2.h
diff --git a/chrome/browser/ui/libgtkui/native_theme_gtk.h b/chrome/browser/ui/libgtkui/native_theme_gtk2.h
similarity index 78%
rename from chrome/browser/ui/libgtkui/native_theme_gtk.h
rename to chrome/browser/ui/libgtkui/native_theme_gtk2.h
index 18747ec7ce38d1d91ac34262bd1bc66f8774a40a..b3dda4888fb9ad12125801322b3a2414c7afd02e 100644
--- a/chrome/browser/ui/libgtkui/native_theme_gtk.h
+++ b/chrome/browser/ui/libgtkui/native_theme_gtk2.h
@@ -2,14 +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_GTK_H_
-#define CHROME_BROWSER_UI_LIBGTKUI_NATIVE_THEME_GTK_H_
-
-#include <gtk/gtk.h>
+#ifndef CHROME_BROWSER_UI_LIBGTKUI_NATIVE_THEME_GTK2_H_
+#define CHROME_BROWSER_UI_LIBGTKUI_NATIVE_THEME_GTK2_H_
 
 #include "base/macros.h"
 #include "ui/native_theme/native_theme_base.h"
 
+typedef struct _GtkWidget GtkWidget;
+
 namespace libgtkui {
 
 // A version of NativeTheme that uses GTK2 supplied colours instead of the
@@ -31,10 +31,9 @@ class NativeThemeGtk2 : public ui::NativeThemeBase {
       const gfx::Rect& rect,
       const MenuItemExtraParams& menu_item) const override;
 
-  // Gets a ChromeGtkFrame theme color; returns true on success. Always returns
-  // false in GTK3.
-  bool GetChromeStyleColor(const char* style_property,
-                           SkColor* ret_color) const;
+ private:
+  NativeThemeGtk2();
+  ~NativeThemeGtk2() override;
 
   // Returns various widgets for theming use.
   GtkWidget* GetWindow() const;
@@ -47,13 +46,9 @@ class NativeThemeGtk2 : public ui::NativeThemeBase {
   GtkWidget* GetMenu() const;
   GtkWidget* GetMenuItem() const;
 
- private:
-  NativeThemeGtk2();
-  ~NativeThemeGtk2() override;
-
   DISALLOW_COPY_AND_ASSIGN(NativeThemeGtk2);
 };
 
 }  // namespace libgtkui
 
-#endif  // CHROME_BROWSER_UI_LIBGTKUI_NATIVE_THEME_GTK_H_
+#endif  // CHROME_BROWSER_UI_LIBGTKUI_NATIVE_THEME_GTK2_H_