[Regression fix] [Data URI parser] Accept data URI with invalid mediatype data

net/url_request/url_request_data_job.cc

Index: net/url_request/url_request_data_job.cc
diff --git a/net/url_request/url_request_data_job.cc b/net/url_request/url_request_data_job.cc
index e0746467079836f42aff97cdbe2029b6e5669eb9..9d1a282656c6169766818267ceeafa57bb6ab156 100644
--- a/net/url_request/url_request_data_job.cc
+++ b/net/url_request/url_request_data_job.cc
@@ -7,6 +7,7 @@
 #include "net/url_request/url_request_data_job.h"
 
 #include "net/base/data_url.h"
+#include "net/base/mime_util.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_response_headers.h"
 #include "url/gurl.h"
@@ -34,9 +35,11 @@ int URLRequestDataJob::BuildResponse(const GURL& url,
     // the "token" ABNF in the HTTP spec. When DataURL::Parse() call is
     // successful, it's guaranteed that the string in |charset| follows the
     // "token" ABNF.
-    std::string content_type_header =
-        "Content-Type: " + *mime_type + ";charset=" + *charset;
-    headers->AddHeader(content_type_header);
+    if (ParseMimeTypeWithoutParameter(*mime_type, NULL, NULL)) {
+      std::string content_type_header =
+          "Content-Type: " + *mime_type + ";charset=" + *charset;
+      headers->AddHeader(content_type_header);
+    }
     headers->AddHeader("Access-Control-Allow-Origin: *");
   }