Update net::HttpUtil::IsSafeHeader() with two new headers

net/http/http_util_unittest.cc

Index: net/http/http_util_unittest.cc
diff --git a/net/http/http_util_unittest.cc b/net/http/http_util_unittest.cc
index 8293c8031517fe4a3ecb0dd55448f4065cfb0156..fc38137e54f387f7ebf3da4175a68eb764681475 100644
--- a/net/http/http_util_unittest.cc
+++ b/net/http/http_util_unittest.cc
@@ -27,6 +27,8 @@ TEST(HttpUtilTest, IsSafeHeader) {
     "pRoXy-FoO",
     "accept-charset",
     "accept-encoding",
+    "access-control-request-headers",
+    "access-control-request-method",
     "connection",
     "content-length",
     "cookie",
@@ -61,6 +63,11 @@ TEST(HttpUtilTest, IsSafeHeader) {
     "accept_charset",
     "accept-encodinga",
     "accept_encoding",
+    "access-control-request-headersa",
+    "access-control-request-header",
+    "access_control_request_header",
+    "access-control-request-methoda",
+    "access_control_request_method",
     "connectiona",
     "content-lengtha",
     "content_length",