GTK: Turn on the GTK+ integration by default.

chrome/browser/gtk/gtk_theme_provider.h

 // Copyright (c) 2010 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_GTK_GTK_THEME_PROVIDER_H_
 #define CHROME_BROWSER_GTK_GTK_THEME_PROVIDER_H_
 
 #include <gtk/gtk.h>
 #include <map>
 #include <string>
@@ skipping 90 matching lines @@
   }
   const SkColor& get_inactive_selection_fg_color() const {
     return inactive_selection_fg_color_;
   }
 
   // These functions do not add a ref to the returned pixbuf, and it should not
   // be unreffed.  If |native| is true, get the GTK_STOCK version of the icon.
   static GdkPixbuf* GetFolderIcon(bool native);
   static GdkPixbuf* GetDefaultFavicon(bool native);
 
+  // Whether we use the GTK theme by default in the current desktop
+  // environment. Returns true when we GTK defaults to on.
+  static bool DefaultUsesSystemTheme();
+
  private:
   typedef std::map<int, SkColor> ColorMap;
   typedef std::map<int, color_utils::HSL> TintMap;
   typedef std::map<int, SkBitmap*> ImageCache;
 
   // Clears all the GTK color overrides.
   virtual void ClearAllThemeData();
 
   // Load theme data from preferences, possibly picking colors from GTK.
   virtual void LoadThemePrefs();
@@ skipping 90 matching lines @@
 
   // The default folder icon and default bookmark icon for the GTK theme.
   // These are static because the system can only have one theme at a time.
   // They are cached when they are requested the first time, and cleared when
   // the system theme changes.
   static GdkPixbuf* default_folder_icon_;
   static GdkPixbuf* default_bookmark_icon_;
 };
 
 #endif  // CHROME_BROWSER_GTK_GTK_THEME_PROVIDER_H_