Remove obsolete methods from IPC::Channel and related classes.

content/public/common/child_process_host.h

Index: content/public/common/child_process_host.h
diff --git a/content/public/common/child_process_host.h b/content/public/common/child_process_host.h
index d77bf0fd5fe5f666e98b24005c6abbb29510d960..c82774e2d843c1ae3575b722101f68628de3327d 100644
--- a/content/public/common/child_process_host.h
+++ b/content/public/common/child_process_host.h
@@ -101,11 +101,6 @@ class CONTENT_EXPORT ChildProcessHost : public IPC::Sender {
   // bind
   // interfaces exposed to it from the child.
   virtual service_manager::InterfaceProvider* GetRemoteInterfaces() = 0;
-
-#if defined(OS_POSIX)
-  // See IPC::Channel::TakeClientFileDescriptor.
-  virtual base::ScopedFD TakeClientFileDescriptor() = 0;
-#endif
 };
 
 };  // namespace content