Prepending view-source: does not load the source of the userscript.

content/browser/tab_contents/tab_contents.cc

Index: content/browser/tab_contents/tab_contents.cc
diff --git a/content/browser/tab_contents/tab_contents.cc b/content/browser/tab_contents/tab_contents.cc
index 9f783d0b931986641db42717f577078d2a274ccb..6566c268eef8bcb6e871f27a778e9dc727927b65 100644
--- a/content/browser/tab_contents/tab_contents.cc
+++ b/content/browser/tab_contents/tab_contents.cc
@@ -200,6 +200,9 @@ void MakeNavigateParams(const NavigationEntryImpl& entry,
   params->current_history_list_offset = controller.GetLastCommittedEntryIndex();
   params->current_history_list_length = controller.GetEntryCount();
   params->url = entry.GetURL();
+  // We only want to allow downloading if "view-source:" is not pre-pended.
+  params->allow_download =
+      !entry.GetVirtualURL().SchemeIs(chrome::kViewSourceScheme);
   params->referrer = entry.GetReferrer();
   params->transition = entry.GetTransitionType();
   params->state = entry.GetContentState();