Always use ChannelMojo for content child processes.

content/public/common/child_process_host.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_COMMON_CHILD_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_COMMON_CHILD_PROCESS_HOST_H_
 
 #include <stdint.h>
 
 #include "base/files/scoped_file.h"
@@ skipping 63 matching lines @@
   // The |flags| argument accepts one or more flags such as CHILD_ALLOW_SELF.
   // Pass only CHILD_NORMAL if none of these special behaviors are required.
   //
   // On failure, returns an empty FilePath.
   static base::FilePath GetChildPath(int flags);
 
   // Send the shutdown message to the child process.
   // Does not check with the delegate's CanShutdown.
   virtual void ForceShutdown() = 0;
 
-  // Creates the IPC channel.  Returns the channel id if it succeeded, an
-  // empty string otherwise
-  virtual std::string CreateChannel() = 0;
-
   // Creates the IPC channel on top of Mojo. Returns the Mojo channel token if
   // succeeded, or an empty string on failure.
   //
   // DEPRECATED: Don't use this. Instead implement GetRemoteInterfaces() in the
   // delegate and use the CreateChannelMojo() version below.
   virtual std::string CreateChannelMojo(const std::string& child_token) = 0;
 
   // Creates the IPC channel over a Mojo message pipe. The pipe connection is
   // brokered through the shell like any other service connection.
   virtual void CreateChannelMojo() = 0;
@@ skipping 10 matching lines @@
 
 #if defined(OS_POSIX)
   // See IPC::Channel::TakeClientFileDescriptor.
   virtual base::ScopedFD TakeClientFileDescriptor() = 0;
 #endif
 };
 
 };  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_CHILD_PROCESS_HOST_H_