Make it easier to create new IPC channel types (i.e. renderer/plugin). Inste...

chrome/browser/automation/automation_provider.cc

Index: chrome/browser/automation/automation_provider.cc
===================================================================
--- chrome/browser/automation/automation_provider.cc	(revision 9103)
+++ chrome/browser/automation/automation_provider.cc	(working copy)
@@ -1071,7 +1071,9 @@
   IPC::Message* msg = new IPC::Message(
     message.routing_id(), AutomationMsg_RedirectsFromResponse::ID,
     IPC::Message::PRIORITY_NORMAL);
-  msg->WriteInt(-1);   // Negative string count indicates an error.
+  msg->WriteBool(false);
+  std::vector<GURL> empty;
+  ParamTraits<std::vector<GURL>>::Write(msg, empty);
   Send(msg);
 }
 
@@ -1554,14 +1556,17 @@
   IPC::Message* msg = new IPC::Message(redirect_query_routing_id_,
                                        AutomationMsg_RedirectsFromResponse::ID,
                                        IPC::Message::PRIORITY_NORMAL);
+  std::vector<GURL> redirects_gurl;
   if (success) {
-    msg->WriteInt(static_cast<int>(redirects->size()));
+    msg->WriteBool(true);
     for (size_t i = 0; i < redirects->size(); i++)
-      IPC::ParamTraits<GURL>::Write(msg, redirects->at(i));
+      redirects_gurl.push_back(redirects->at(i));
   } else {
     msg->WriteInt(-1);  // Negative count indicates failure.
   }
 
+  ParamTraits<std::vector<GURL>>::Write(msg, redirects_gurl);
+
   Send(msg);
   redirect_query_ = NULL;
 }