Fix a bug where redirect chain gets lost on process swap.

content/common/view_messages.h

Index: content/common/view_messages.h
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index 45aa69e8a01a3b01abc3a45a8d1b099821316b11..ff076166f929fa015c1277edd0fd72e8cded2069 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -591,6 +591,13 @@ IPC_STRUCT_BEGIN(ViewMsg_Navigate_Params)
 
   // Extra headers (separated by \n) to send during the request.
   IPC_STRUCT_MEMBER(std::string, extra_headers)
+
+  // The following two members identify a previous request that has been
+  // created before this navigation is being transferred to a new render view.
+  // This serves the purpose of recycling the old request.
+  // Unless this refers to a transferred navigation, these values are -1 and -1.
+  IPC_STRUCT_MEMBER(int, transferred_request_child_id)
+  IPC_STRUCT_MEMBER(int, transferred_request_request_id)
 IPC_STRUCT_END()
 
 IPC_STRUCT_BEGIN(ViewMsg_New_Params)