Update legacy Tuple-using code.

content/browser/renderer_host/render_widget_host_impl.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/renderer_host/render_widget_host_impl.h"
 
 #include <math.h>
 #include <set>
 #include <utility>
 
@@ skipping 1410 matching lines @@
 bool RenderWidgetHostImpl::OnSwapCompositorFrame(
     const IPC::Message& message) {
   // This trace event is used in
   // chrome/browser/extensions/api/cast_streaming/performance_test.cc
   TRACE_EVENT0("test_fps",
                TRACE_DISABLED_BY_DEFAULT("OnSwapCompositorFrame"));
   ViewHostMsg_SwapCompositorFrame::Param param;
   if (!ViewHostMsg_SwapCompositorFrame::Read(&message, &param))
     return false;
   scoped_ptr<cc::CompositorFrame> frame(new cc::CompositorFrame);
-  uint32 output_surface_id = param.a;
-  param.b.AssignTo(frame.get());
+  uint32 output_surface_id = get<0>(param);
+  get<1>(param).AssignTo(frame.get());
   std::vector<IPC::Message> messages_to_deliver_with_frame;
-  messages_to_deliver_with_frame.swap(param.c);
+  messages_to_deliver_with_frame.swap(get<2>(param));
 
   latency_tracker_.OnSwapCompositorFrame(&frame->metadata.latency_info);
 
   input_router_->OnViewUpdated(
       GetInputRouterViewFlagsFromCompositorFrameMetadata(frame->metadata));
 
   if (view_) {
     view_->OnSwapCompositorFrame(output_surface_id, frame.Pass());
     view_->DidReceiveRendererFrame();
   } else {
@@ skipping 719 matching lines @@
 }
 #endif
 
 SkColorType RenderWidgetHostImpl::PreferredReadbackFormat() {
   if (view_)
     return view_->PreferredReadbackFormat();
   return kN32_SkColorType;
 }
 
 }  // namespace content