Revert of Bootstrap Mojo IPC independent of Chrome IPC

content/zygote/zygote_linux.cc

 // 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.
 
 #include "content/zygote/zygote_linux.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <poll.h>
 #include <signal.h>
@@ skipping 418 matching lines @@
   }
 
   base::ScopedFD read_pipe, write_pipe;
   base::ProcessId pid = 0;
   if (helper) {
     int ipc_channel_fd = LookUpFd(fd_mapping, kPrimaryIPCChannel);
     if (ipc_channel_fd < 0) {
       DLOG(ERROR) << "Failed to find kPrimaryIPCChannel in FD mapping";
       return -1;
     }
-    int mojo_channel_fd = LookUpFd(fd_mapping, kMojoIPCChannel);
-    if (mojo_channel_fd < 0) {
-      DLOG(ERROR) << "Failed to find kMojoIPCChannel in FD mapping";
-      return -1;
-    }
     std::vector<int> fds;
     fds.push_back(ipc_channel_fd);  // kBrowserFDIndex
     fds.push_back(pid_oracle.get());  // kPIDOracleFDIndex
-    fds.push_back(mojo_channel_fd);  // kMojoParentFDIndex
     pid = helper->Fork(process_type, fds, channel_id);
 
     // Helpers should never return in the child process.
     CHECK_NE(pid, 0);
   } else {
     CreatePipe(&read_pipe, &write_pipe);
     if (sandbox_flags_ & kSandboxLinuxPIDNS &&
         sandbox_flags_ & kSandboxLinuxUserNS) {
       pid = sandbox::NamespaceSandbox::ForkInNewPidNamespace(
           /*drop_capabilities_in_child=*/true);
@@ skipping 213 matching lines @@
 bool Zygote::HandleGetSandboxStatus(int fd, base::PickleIterator iter) {
   if (HANDLE_EINTR(write(fd, &sandbox_flags_, sizeof(sandbox_flags_))) !=
                    sizeof(sandbox_flags_)) {
     PLOG(ERROR) << "write";
   }
 
   return false;
 }
 
 }  // namespace content