Linux: have the sandbox binary create the sandbox directory.

chrome/browser/zygote_host_linux.cc

 // Copyright (c) 2009 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 <unistd.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
@@ skipping 29 matching lines @@
   base::file_handle_mapping_vector fds_to_map;
   fds_to_map.push_back(std::make_pair(fds[1], 3));
 
   const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
   if (browser_command_line.HasSwitch(switches::kZygoteCmdPrefix)) {
     const std::wstring prefix =
         browser_command_line.GetSwitchValue(switches::kZygoteCmdPrefix);
     cmd_line.PrependWrapper(prefix);
   }
 
-  const std::string kSandboxPath =
-    WideToASCII(std::wstring(L"/var/run/") +
-                chrome::kBrowserProcessExecutableName +
-                L"-sandbox");
-
   struct stat st;
   if (stat(kSandboxBinary, &st) == 0) {
     if (access(kSandboxBinary, X_OK) == 0 &&
         (st.st_mode & S_ISUID) &&
-        (st.st_mode & S_IXOTH) &&
-        access(kSandboxPath.c_str(), F_OK) == 0) {
+        (st.st_mode & S_IXOTH)) {
       cmd_line.PrependWrapper(ASCIIToWide(kSandboxBinary));
     } 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 "
-                 << kSandboxBinary << " is mode 4755 and that "
-                 << kSandboxPath << " exists";
+                 << kSandboxBinary << " is mode 4755.";
     }
   }
 
   // Start up the sandbox host process and get the file descriptor for the
   // renderers to talk to it.
   const int sfd = Singleton<RenderSandboxHostLinux>()->GetRendererSocket();
   fds_to_map.push_back(std::make_pair(sfd, 5));
 
   base::ProcessHandle process;
   base::LaunchApp(cmd_line.argv(), fds_to_map, false, &process);
@@ skipping 73 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;
 }