GTK: First draft of using native themes, partially based on evan's CL 118358.

chrome/test/testing_profile.h

Index: chrome/test/testing_profile.h
diff --git a/chrome/test/testing_profile.h b/chrome/test/testing_profile.h
index d791fdd473fd278c36bba0efb4420ca3f673d4d4..b360ac25a5715a8b054bbc5a4d8ac3c5a785e27d 100644
--- a/chrome/test/testing_profile.h
+++ b/chrome/test/testing_profile.h
@@ -134,6 +134,7 @@ class TestingProfile : public Profile {
   }
   virtual void InitThemes() { }
   virtual void SetTheme(Extension* extension) { }
+  virtual void SetNativeTheme() { }
   virtual void ClearTheme() { }
   virtual ThemeProvider* GetThemeProvider() {
     return theme_provider_.get();