Removing x-x509-user-cert mime handler.

content/browser/loader/mime_type_resource_handler.cc

Index: content/browser/loader/mime_type_resource_handler.cc
diff --git a/content/browser/loader/mime_type_resource_handler.cc b/content/browser/loader/mime_type_resource_handler.cc
index 59c2b5310660487b1a0ccdc7f9591da7ebcc14bc..5d1672c593cc583f287520dd3078361108f4e867 100644
--- a/content/browser/loader/mime_type_resource_handler.cc
+++ b/content/browser/loader/mime_type_resource_handler.cc
@@ -341,6 +341,7 @@ bool MimeTypeResourceHandler::SelectNextHandler(bool* defer) {
   ResourceRequestInfoImpl* info = GetRequestInfo();
   const std::string& mime_type = response_->head.mime_type;
 
+#if defined(OS_ANDROID)
   if (mime_util::IsSupportedCertificateMimeType(mime_type)) {
     // Install certificate file.
     info->set_is_download(true);
@@ -348,6 +349,7 @@ bool MimeTypeResourceHandler::SelectNextHandler(bool* defer) {
         new CertificateResourceHandler(request()));
     return UseAlternateNextHandler(handler.Pass(), std::string());
   }
+#endif
 
   // Allow requests for object/embed tags to be intercepted as streams.
   if (info->GetResourceType() == content::RESOURCE_TYPE_OBJECT) {
@@ -371,8 +373,10 @@ bool MimeTypeResourceHandler::SelectNextHandler(bool* defer) {
 
   bool must_download = MustDownload();
   if (!must_download) {
-    if (mime_util::IsSupportedMimeType(mime_type))
+    if (mime_util::IsSupportedMimeType(mime_type) &&
+        !mime_util::IsSupportedCertificateMimeType(mime_type)) {
       return true;
+    }
 
     bool handled_by_plugin;
     if (!SelectPluginHandler(defer, &handled_by_plugin))