Add a new GetInstance() method for singleton classes used in chrome/browser files.

chrome/browser/zygote_host_linux.cc

 // Copyright (c) 2010 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 "chrome/browser/zygote_host_linux.h"
 
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
@@ skipping 48 matching lines @@
       using_suid_sandbox_(false),
       have_read_sandbox_status_word_(false),
       sandbox_status_(0) {
 }
 
 ZygoteHost::~ZygoteHost() {
   if (init_)
     close(control_fd_);
 }
 
+// static
+ZygoteHost* ZygoteHost::GetInstance() {
+  return Singleton<ZygoteHost>::get();
+}
+
 void ZygoteHost::Init(const std::string& sandbox_cmd) {
   DCHECK(!init_);
   init_ = true;
 
   FilePath chrome_path;
   CHECK(PathService::Get(base::FILE_EXE, &chrome_path));
   CommandLine cmd_line(chrome_path);
 
   cmd_line.AppendSwitchASCII(switches::kProcessType, switches::kZygoteProcess);
 
@@ skipping 43 matching lines @@
     } else {
       LOG(FATAL) << "The SUID sandbox helper binary was found, but is not "
                     "configured correctly. Rather than run without sandboxing "
                     "I'm aborting now. You need to make sure that "
                  << sandbox_binary_ << " is mode 4755 and owned by root.";
     }
   }
 
   // Start up the sandbox host process and get the file descriptor for the
   // renderers to talk to it.
-  const int sfd = Singleton<RenderSandboxHostLinux>()->GetRendererSocket();
+  const int sfd = RenderSandboxHostLinux::GetInstance()->GetRendererSocket();
   fds_to_map.push_back(std::make_pair(sfd, 5));
 
   int dummy_fd = -1;
   if (using_suid_sandbox_) {
     dummy_fd = socket(PF_UNIX, SOCK_DGRAM, 0);
     CHECK(dummy_fd >= 0);
     fds_to_map.push_back(std::make_pair(dummy_fd, 7));
   }
 
   base::ProcessHandle process;
@@ skipping 201 matching lines @@
       !read_pickle.ReadBool(&iter, &tmp_child_exited)) {
     LOG(WARNING) << "Error parsing DidProcessCrash response from zygote.";
     return false;
   }
 
   if (child_exited)
     *child_exited = tmp_child_exited;
 
   return did_crash;
 }