Update legacy Tuple-using code.

content/renderer/browser_plugin/browser_plugin_manager.cc

 // Copyright (c) 2012 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 "content/renderer/browser_plugin/browser_plugin_manager.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/browser_plugin/browser_plugin_constants.h"
 #include "content/common/browser_plugin/browser_plugin_messages.h"
 #include "content/common/frame_messages.h"
 #include "content/public/renderer/browser_plugin_delegate.h"
@@ skipping 114 matching lines @@
   return RenderThreadImpl::current()->Send(msg);
 }
 
 void BrowserPluginManager::OnCompositorFrameSwappedPluginUnavailable(
     const IPC::Message& message) {
   BrowserPluginMsg_CompositorFrameSwapped::Param param;
   if (!BrowserPluginMsg_CompositorFrameSwapped::Read(&message, &param))
     return;
 
   FrameHostMsg_CompositorFrameSwappedACK_Params params;
-  params.producing_host_id = param.b.producing_host_id;
-  params.producing_route_id = param.b.producing_route_id;
-  params.output_surface_id = param.b.output_surface_id;
+  params.producing_host_id = get<1>(param).producing_host_id;
+  params.producing_route_id = get<1>(param).producing_route_id;
+  params.output_surface_id = get<1>(param).output_surface_id;
   Send(new BrowserPluginHostMsg_CompositorFrameSwappedACK(
-      message.routing_id(), param.a, params));
+      message.routing_id(), get<0>(param), params));
 }
 
 }  // namespace content