webservd: Rename "chromeos" -> "brillo" in include paths and namespaces

libchromeos is transitioning to libbrillo and chromeos namespaces
and include directory is changing to brillo.

Bug: 24872993
Change-Id: Iba15692972a0c24ec87ac8e51d4eb032214149b0
diff --git a/libwebserv/request_utils.h b/libwebserv/request_utils.h
index c825c3c..390f1d5 100644
--- a/libwebserv/request_utils.h
+++ b/libwebserv/request_utils.h
@@ -19,7 +19,7 @@
 #include <vector>
 
 #include <base/callback_forward.h>
-#include <chromeos/errors/error.h>
+#include <brillo/errors/error.h>
 #include <libwebserv/export.h>
 
 namespace libwebserv {
@@ -35,7 +35,7 @@
 using GetRequestDataErrorCallback =
     base::Callback<void(std::unique_ptr<Request> request,
                         std::unique_ptr<Response> response,
-                        const chromeos::Error* error)>;
+                        const brillo::Error* error)>;
 
 // Reads the request data from |request| asynchronously and returns the data
 // by calling |success_callback|. If an error occurred, |error_callback| is