go.crypto: use golang.org/x/... import paths

LGTM=bradfitz
R=rsc, bradfitz
CC=golang-codereviews
https://golang.org/cl/167190043
diff --git a/bcrypt/bcrypt.go b/bcrypt/bcrypt.go
index 10b8d64..b8e18d7 100644
--- a/bcrypt/bcrypt.go
+++ b/bcrypt/bcrypt.go
@@ -8,11 +8,11 @@
 
 // The code is a port of Provos and Mazières's C implementation.
 import (
-	"code.google.com/p/go.crypto/blowfish"
 	"crypto/rand"
 	"crypto/subtle"
 	"errors"
 	"fmt"
+	"golang.org/x/crypto/blowfish"
 	"io"
 	"strconv"
 )