src/pkg/[a-m]*: gofix -r error -force=error

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/5322051
diff --git a/src/pkg/http/httptest/recorder.go b/src/pkg/http/httptest/recorder.go
index f2fedef..f69279f 100644
--- a/src/pkg/http/httptest/recorder.go
+++ b/src/pkg/http/httptest/recorder.go
@@ -8,7 +8,6 @@
 import (
 	"bytes"
 	"http"
-	"os"
 )
 
 // ResponseRecorder is an implementation of http.ResponseWriter that
@@ -38,7 +37,7 @@
 }
 
 // Write always succeeds and writes to rw.Body, if not nil.
-func (rw *ResponseRecorder) Write(buf []byte) (int, os.Error) {
+func (rw *ResponseRecorder) Write(buf []byte) (int, error) {
 	if rw.Body != nil {
 		rw.Body.Write(buf)
 	}