Add custom default theme support and create a managed user default theme.

chrome/browser/themes/theme_service_aurax11.h

Index: chrome/browser/themes/theme_service_aurax11.h
diff --git a/chrome/browser/themes/theme_service_aurax11.h b/chrome/browser/themes/theme_service_aurax11.h
index 96dce92df031d72081e6283cd6ac1063deb04636..b31235b7ba6795312491c39310bfe7b32334974e 100644
--- a/chrome/browser/themes/theme_service_aurax11.h
+++ b/chrome/browser/themes/theme_service_aurax11.h
@@ -5,7 +5,6 @@
 #ifndef CHROME_BROWSER_THEMES_THEME_SERVICE_AURAX11_H_
 #define CHROME_BROWSER_THEMES_THEME_SERVICE_AURAX11_H_
 
-#include "base/prefs/pref_change_registrar.h"
 #include "chrome/browser/themes/theme_service.h"
 
 // A subclass of ThemeService that queries the current ui::LinuxUI instance for
@@ -15,28 +14,12 @@ class ThemeServiceAuraX11 : public ThemeService {
   ThemeServiceAuraX11();
   virtual ~ThemeServiceAuraX11();
 
-  // Overridden from ui::ThemeProvider:
-  virtual SkColor GetColor(int id) const OVERRIDE;
-  virtual bool HasCustomImage(int id) const OVERRIDE;
-
   // Overridden from ThemeService:
   virtual void Init(Profile* profile) OVERRIDE;
-  virtual gfx::Image GetImageNamed(int id) const OVERRIDE;
-  virtual void SetTheme(const extensions::Extension* extension) OVERRIDE;
-  virtual void UseDefaultTheme() OVERRIDE;
   virtual void SetNativeTheme() OVERRIDE;
-  virtual bool UsingDefaultTheme() const OVERRIDE;
   virtual bool UsingNativeTheme() const OVERRIDE;
 
  private:
-  void OnUsesSystemThemeChanged();
-
-  // Whether we'll give the ui::LinuxUI object first shot at providing theme
-  // resources.
-  bool use_system_theme_;
-
-  PrefChangeRegistrar registrar_;
-
   DISALLOW_COPY_AND_ASSIGN(ThemeServiceAuraX11);
 };