Removing x-x509-user-cert mime handler.

net/base/mime_util.cc

Index: net/base/mime_util.cc
diff --git a/net/base/mime_util.cc b/net/base/mime_util.cc
index 0d511201fd0cdfdda126ad480bc0157e5385e33f..8e7496442107da13e9779f826766c35ca53a0657 100644
--- a/net/base/mime_util.cc
+++ b/net/base/mime_util.cc
@@ -359,6 +359,12 @@ bool GetWellKnownMimeTypeFromExtension(const base::FilePath::StringType& ext,
 
 bool GetPreferredExtensionForMimeType(const std::string& mime_type,
                                       base::FilePath::StringType* extension) {
+  // Force .crt extension for client certificates.
+  if (mime_type == "application/x-x509-user-cert") {
+    *extension = "crt";

[mmenke, 2015/10/29 16:40:46]

Shouldn't this just be in secondary_mappings, or primary_mappings?

[svaldez, 2015/10/29 16:54:59]

Putting it in primary/secondary_mappings restricts the extensions that are
allowed for the mime type, while the PreferredExtensionForMimeType is what
determines what to fallback to.

+    return true;
+  }
+
   return g_mime_util.Get().GetPreferredExtensionForMimeType(mime_type,
                                                             extension);
 }