Update legacy Tuple-using code.

content/renderer/browser_plugin/browser_plugin.cc

Index: content/renderer/browser_plugin/browser_plugin.cc
diff --git a/content/renderer/browser_plugin/browser_plugin.cc b/content/renderer/browser_plugin/browser_plugin.cc
index 5551e7be360e77b52a0ff3b0447b7bef23736da2..44b2328c84e1b8d5219a04d850321e55dcfb6bde 100644
--- a/content/renderer/browser_plugin/browser_plugin.cc
+++ b/content/renderer/browser_plugin/browser_plugin.cc
@@ -187,14 +187,15 @@ void BrowserPlugin::OnCompositorFrameSwapped(const IPC::Message& message) {
   guest_crashed_ = false;
 
   scoped_ptr<cc::CompositorFrame> frame(new cc::CompositorFrame);
-  param.b.frame.AssignTo(frame.get());
+  get<1>(param).frame.AssignTo(frame.get());
 
   EnableCompositing(true);
-  compositing_helper_->OnCompositorFrameSwapped(frame.Pass(),
-                                                param.b.producing_route_id,
-                                                param.b.output_surface_id,
-                                                param.b.producing_host_id,
-                                                param.b.shared_memory_handle);
+  compositing_helper_->OnCompositorFrameSwapped(
+      frame.Pass(),
+      get<1>(param).producing_route_id,
+      get<1>(param).output_surface_id,
+      get<1>(param).producing_host_id,
+      get<1>(param).shared_memory_handle);
 }
 
 void BrowserPlugin::OnGuestGone(int browser_plugin_instance_id) {