Update legacy Tuple-using code.

extensions/renderer/guest_view/extensions_guest_view_container.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/renderer/guest_view/extensions_guest_view_container.h"
 
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_view.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/guest_view/guest_view_constants.h"
@@ skipping 61 matching lines @@
     const IPC::Message& message) {
   ExtensionMsg_GuestAttached::Param param;
   if (!ExtensionMsg_GuestAttached::Read(&message, &param))
     return;
 
   // If we don't have a callback then there's nothing more to do.
   if (!HasCallback())
     return;
 
   content::RenderView* guest_proxy_render_view =
-      content::RenderView::FromRoutingID(param.b);
+      content::RenderView::FromRoutingID(get<1>(param));
   // TODO(fsamuel): Should we be reporting an error to JavaScript or DCHECKing?
   if (!guest_proxy_render_view)
     return;
 
   v8::HandleScope handle_scope(isolate());
   v8::Handle<v8::Function> callback = GetCallback();
   v8::Handle<v8::Context> context = callback->CreationContext();
   if (context.IsEmpty())
     return;
 
@@ skipping 138 matching lines @@
 }
 
 void ExtensionsGuestViewContainer::HandlePendingResponseCallback(
     const IPC::Message& message) {
   CHECK(pending_response_.get());
   linked_ptr<Request> pending_response(pending_response_.release());
   pending_response->HandleResponse(message);
 }
 
 }  // namespace extensions