Update legacy Tuple-using code.

content/browser/devtools/render_view_devtools_agent_host.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/browser/devtools/render_view_devtools_agent_host.h"
 
 #include "base/basictypes.h"
 #include "base/json/json_writer.h"
 #include "base/lazy_instance.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 462 matching lines @@
 
 void RenderViewDevToolsAgentHost::RenderViewCrashed() {
   inspector_handler_->TargetCrashed();
 }
 
 void RenderViewDevToolsAgentHost::OnSwapCompositorFrame(
     const IPC::Message& message) {
   ViewHostMsg_SwapCompositorFrame::Param param;
   if (!ViewHostMsg_SwapCompositorFrame::Read(&message, &param))
     return;
-  page_handler_->OnSwapCompositorFrame(param.b.metadata);
+  page_handler_->OnSwapCompositorFrame(get<1>(param).metadata);
 }
 
 void RenderViewDevToolsAgentHost::SynchronousSwapCompositorFrame(
     const cc::CompositorFrameMetadata& frame_metadata) {
   if (!render_view_host_)
     return;
   page_handler_->OnSwapCompositorFrame(frame_metadata);
 }
 
 void RenderViewDevToolsAgentHost::OnSaveAgentRuntimeState(
@@ skipping 12 matching lines @@
 }
 
 void RenderViewDevToolsAgentHost::DispatchOnInspectorFrontend(
     const std::string& message) {
   if (!IsAttached() || !render_view_host_)
     return;
   SendMessageToClient(message);
 }
 
 }  // namespace content