Remove unused parts of IPC::ChannelHandle.

ipc/ipc_channel_common.cc

Index: ipc/ipc_channel_common.cc
diff --git a/ipc/ipc_channel_common.cc b/ipc/ipc_channel_common.cc
index 6225a869ae6f4f18036294e8a4585640d2921242..bf39bba490e549b2e9a3581600f079186fabf120 100644
--- a/ipc/ipc_channel_common.cc
+++ b/ipc/ipc_channel_common.cc
@@ -57,17 +57,6 @@ std::unique_ptr<Channel> Channel::CreateServer(
 #endif
 }
 
-// static
-void Channel::GenerateMojoChannelHandlePair(
-    const std::string& name_postfix,
-    IPC::ChannelHandle* handle0,
-    IPC::ChannelHandle* handle1) {
-  DCHECK_NE(handle0, handle1);
-  mojo::MessagePipe message_pipe;
-  *handle0 = ChannelHandle(message_pipe.handle0.release());
-  *handle1 = ChannelHandle(message_pipe.handle1.release());
-}
-
 Channel::~Channel() {
 }