Update routing id of pending resource requests for reparented iframes.

content/browser/renderer_host/resource_dispatcher_host.cc

Index: content/browser/renderer_host/resource_dispatcher_host.cc
diff --git a/content/browser/renderer_host/resource_dispatcher_host.cc b/content/browser/renderer_host/resource_dispatcher_host.cc
index a3c4bd4a6ff4560da43f314677ec4ef88b5fde1d..b81722d9a12782c7c9a3e83c81737f4682715daa 100644
--- a/content/browser/renderer_host/resource_dispatcher_host.cc
+++ b/content/browser/renderer_host/resource_dispatcher_host.cc
@@ -345,6 +345,8 @@ bool ResourceDispatcherHost::OnMessageReceived(const IPC::Message& message,
     IPC_MESSAGE_HANDLER(ResourceHostMsg_DataDownloaded_ACK, OnDataDownloadedACK)
     IPC_MESSAGE_HANDLER(ResourceHostMsg_UploadProgress_ACK, OnUploadProgressACK)
     IPC_MESSAGE_HANDLER(ResourceHostMsg_CancelRequest, OnCancelRequest)
+    IPC_MESSAGE_HANDLER(ResourceHostMsg_TransferRequestToNewPage,
+                        OnTransferRequestToNewPage)
     IPC_MESSAGE_HANDLER(ResourceHostMsg_FollowRedirect, OnFollowRedirect)
     IPC_MESSAGE_HANDLER(ViewHostMsg_SwapOut_ACK, OnSwapOutACK)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidLoadResourceFromMemoryCache,
@@ -641,6 +643,24 @@ void ResourceDispatcherHost::OnCancelRequest(int request_id) {
   CancelRequest(filter_->child_id(), request_id, true);
 }
 
+// Assigns the pending request a new routing_id because it was transferred
+// to a new page.
+void ResourceDispatcherHost::OnTransferRequestToNewPage(int new_routing_id,
+                                                        int request_id) {
+  PendingRequestList::iterator i = pending_requests_.find(
+      GlobalRequestID(filter_->child_id(), request_id));
+  if (i == pending_requests_.end()) {
+    // We probably want to remove this warning eventually, but I wanted to be
+    // able to notice when this happens during initial development since it
+    // should be rare and may indicate a bug.
+    DLOG(WARNING) << "Updating a request that wasn't found";
+    return;
+  }
+  net::URLRequest* request = i->second;
+  ResourceDispatcherHostRequestInfo* info = InfoForRequest(request);
+  info->set_route_id(new_routing_id);
+}
+
 void ResourceDispatcherHost::OnFollowRedirect(
     int request_id,
     bool has_new_first_party_for_cookies,