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

Looks like W3C added Access-Control-Request-Headers and Access-Control-Request-Method to the list of unsafe headers.
http://www.w3.org/TR/XMLHttpRequest/#the-setrequestheader-method

BUG=126264

Review URL: https://chromiumcodereview.appspot.com/10365012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@136923 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/net/http/http_util_unittest.cc b/net/http/http_util_unittest.cc
index 8293c803..fc38137 100644
--- a/net/http/http_util_unittest.cc
+++ b/net/http/http_util_unittest.cc
@@ -27,6 +27,8 @@
     "pRoXy-FoO",
     "accept-charset",
     "accept-encoding",
+    "access-control-request-headers",
+    "access-control-request-method",
     "connection",
     "content-length",
     "cookie",
@@ -61,6 +63,11 @@
     "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",