Block renderer-initiated main frame navigations to data URLs

content/public/browser/navigation_handle.h

Index: content/public/browser/navigation_handle.h
diff --git a/content/public/browser/navigation_handle.h b/content/public/browser/navigation_handle.h
index b81bb398ff2d943f935716d3cf10ac430cc1a44a..317970ac2ce5ee73ce72c3defd680489e8f94882 100644
--- a/content/public/browser/navigation_handle.h
+++ b/content/public/browser/navigation_handle.h
@@ -183,6 +183,11 @@ class CONTENT_EXPORT NavigationHandle {
   // errors that leave the user on the previous page.
   virtual bool HasCommitted() = 0;
 
+  // Whether the navigation is a download. This is useful when the navigation

[nasko, 2017/03/28 19:58:01]

nit: "navigation request", since navigations themselves aren't really a
download. The navigation request ends up resulting in a download. 

[meacer, 2017/03/30 20:43:55]

Done.

+  // hasn't committed yet, in which case HasCommitted() will return false even
+  // if the navigation is not a download.
+  virtual bool IsDownload() = 0;
+
   // Whether the navigation resulted in an error page.
   // Note that if an error page reloads, this will return true even though
   // GetNetErrorCode will be net::OK.