Cleanup: Get rid of OS_WIN/OS_POSIX ifdefs from MojoApplication

ipc/mojo/ipc_channel_mojo.cc

Index: ipc/mojo/ipc_channel_mojo.cc
diff --git a/ipc/mojo/ipc_channel_mojo.cc b/ipc/mojo/ipc_channel_mojo.cc
index 71c373e01cf07a63708871ae3077c121fc0f3e31..65830f485a5b1baf9a53ca4e39515bb1ba3b813d 100644
--- a/ipc/mojo/ipc_channel_mojo.cc
+++ b/ipc/mojo/ipc_channel_mojo.cc
@@ -72,17 +72,6 @@ class MojoChannelFactory : public ChannelFactory {
   scoped_refptr<base::TaskRunner> io_thread_task_runner_;
 };
 
-mojo::embedder::PlatformHandle ToPlatformHandle(
-    const ChannelHandle& handle) {
-#if defined(OS_POSIX) && !defined(OS_NACL)
-  return mojo::embedder::PlatformHandle(handle.socket.fd);
-#elif defined(OS_WIN)
-  return mojo::embedder::PlatformHandle(handle.pipe.handle);
-#else
-#error "Unsupported Platform!"
-#endif
-}
-
 } // namespace
 
 //------------------------------------------------------------------------------
@@ -140,7 +129,8 @@ void ChannelMojo::InitOnIOThread() {
   mojo::ScopedMessagePipeHandle control_pipe =
       mojo::embedder::CreateChannelOnIOThread(
           mojo::embedder::ScopedPlatformHandle(
-              ToPlatformHandle(bootstrap_->TakePipeHandle())),
+              mojo::embedder::PlatformHandle(
+                  bootstrap_->TakePipeHandle().platform_file())),
           &channel_info);
   channel_info_.reset(channel_info);