Removing x-x509-user-cert mime handler.

chrome/browser/download/download_target_determiner.cc

Index: chrome/browser/download/download_target_determiner.cc
diff --git a/chrome/browser/download/download_target_determiner.cc b/chrome/browser/download/download_target_determiner.cc
index 32d6563a2f596b1db57d844e3e41e954b53acc2f..44d05aee03707f4da9c1aeb8070a55f94f56c45f 100644
--- a/chrome/browser/download/download_target_determiner.cc
+++ b/chrome/browser/download/download_target_determiner.cc
@@ -194,13 +194,20 @@ DownloadTargetDeterminer::Result
     // (WebStore, Drag&Drop). Treat the path as a virtual path. We will
     // eventually determine whether this is a local path and if not, figure out
     // a local path.
+
+    std::string suggested_filename = download_->GetSuggestedFilename();
+    if (suggested_filename.empty() &&
+        download_->GetMimeType() == "application/x-x509-user-cert") {
+      suggested_filename = "user.crt";
+    }
+
     std::string default_filename(
         l10n_util::GetStringUTF8(IDS_DEFAULT_DOWNLOAD_FILENAME));
     base::FilePath generated_filename = net::GenerateFileName(
         download_->GetURL(),
         download_->GetContentDisposition(),
         GetProfile()->GetPrefs()->GetString(prefs::kDefaultCharset),
-        download_->GetSuggestedFilename(),
+        suggested_filename,
         download_->GetMimeType(),
         default_filename);
     should_prompt_ = ShouldPromptForDownload(generated_filename);