This patch caused Chrome to be unable to load any web pages on Chrome OS.

content/browser/browser_child_process_host.cc

 // Copyright (c) 2011 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/browser/browser_child_process_host.h"
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
@@ skipping 65 matching lines @@
     const FilePath& exposed_dir,
 #elif defined(OS_POSIX)
     bool use_zygote,
     const base::environment_vector& environ,
 #endif
     CommandLine* cmd_line) {
 
   content::GetContentClient()->browser()->AppendExtraCommandLineSwitches(
       cmd_line, id());
 
-#if defined(OS_LINUX)
-  channel()->SetNeedsOverridePeerPid();
-#endif
-
   child_process_.reset(new ChildProcessLauncher(
 #if defined(OS_WIN)
       exposed_dir,
 #elif defined(OS_POSIX)
       use_zygote,
       environ,
       channel()->GetClientFileDescriptor(),
 #endif
       cmd_line,
       &client_));
@@ skipping 64 matching lines @@
   // Must remove the process from the list now, in case it gets used for a
   // new instance before our watcher tells us that the process terminated.
   g_child_process_list.Get().remove(this);
 }
 
 BrowserChildProcessHost::ClientHook::ClientHook(BrowserChildProcessHost* host)
     : host_(host) {
 }
 
 void BrowserChildProcessHost::ClientHook::OnProcessLaunched() {
-  base::ProcessHandle child_handle = host_->child_process_->GetHandle();
-  if (!child_handle) {
+  if (!host_->child_process_->GetHandle()) {
     host_->OnChildDied();
     return;
   }
-  host_->set_handle(child_handle);
-#if defined(OS_LINUX)
-  int32 child_pid = base::GetProcId(child_handle);
-  host_->channel()->OverridePeerPid(child_pid);
-#endif
+  host_->set_handle(host_->child_process_->GetHandle());
   host_->OnProcessLaunched();
 }
 
 BrowserChildProcessHost::Iterator::Iterator()
     : all_(true), type_(UNKNOWN_PROCESS) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)) <<
           "ChildProcessInfo::Iterator must be used on the IO thread.";
   iterator_ = g_child_process_list.Get().begin();
 }
 
@@ skipping 17 matching lines @@
 
     return *iterator_;
   } while (true);
 
   return NULL;
 }
 
 bool BrowserChildProcessHost::Iterator::Done() {
   return iterator_ == g_child_process_list.Get().end();
 }