Generalize content::URLDataSource so that it can be used by the network service.

chrome/browser/ui/webui/theme_source.h

Index: chrome/browser/ui/webui/theme_source.h
diff --git a/chrome/browser/ui/webui/theme_source.h b/chrome/browser/ui/webui/theme_source.h
index b17f7f5196b1ea28ca69b690d5a58e9c1d01eaae..38718f2ac07c8345824aaa2794e19d07dbed41ec 100644
--- a/chrome/browser/ui/webui/theme_source.h
+++ b/chrome/browser/ui/webui/theme_source.h
@@ -29,7 +29,9 @@ class ThemeSource : public content::URLDataSource {
   scoped_refptr<base::SingleThreadTaskRunner> TaskRunnerForRequestPath(
       const std::string& path) const override;
   bool AllowCaching() const override;
-  bool ShouldServiceRequest(const net::URLRequest* request) const override;
+  bool ShouldServiceRequest(const GURL& url,
+                            content::ResourceContext* resource_context,
+                            int render_process_id) const override;
 
  private:
   // Fetches and sends the theme bitmap.