Add first-class support for user scripts

chrome/browser/renderer_host/buffered_resource_handler.cc

Index: chrome/browser/renderer_host/buffered_resource_handler.cc
diff --git a/chrome/browser/renderer_host/buffered_resource_handler.cc b/chrome/browser/renderer_host/buffered_resource_handler.cc
index 33e6489c6b2fb0e2df89fd35be861393b7ab691d..097cd17e5cad007f81adeb4c713da33b3e6e26b5 100644
--- a/chrome/browser/renderer_host/buffered_resource_handler.cc
+++ b/chrome/browser/renderer_host/buffered_resource_handler.cc
@@ -15,6 +15,7 @@
 #include "chrome/browser/renderer_host/resource_dispatcher_host.h"
 #include "chrome/browser/renderer_host/resource_dispatcher_host_request_info.h"
 #include "chrome/browser/renderer_host/x509_user_cert_resource_handler.h"
+#include "chrome/common/extensions/user_script.h"
 #include "chrome/common/url_constants.h"
 #include "net/base/io_buffer.h"
 #include "net/base/mime_sniffer.h"
@@ -448,6 +449,10 @@ bool BufferedResourceHandler::ShouldDownload(bool* need_plugin_list) {
       return true;
   }
 
+  // Special-case user scripts to get downloaded instead of viewed.
+  if (UserScript::HasUserScriptFileExtension(request_->url()))
+    return true;
+
   // MIME type checking.
   if (net::IsSupportedMimeType(type))
     return false;