Make sure only the right processes can access the profile path.

chrome/common/chrome_paths.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 "chrome/common/chrome_paths.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "base/sys_info.h"
 #include "base/version.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths_internal.h"
 #include "chrome/common/chrome_switches.h"
+#include "content/public/common/content_switches.h"
 
 #if defined(OS_MACOSX)
 #include "base/mac/mac_util.h"
 #endif
 
 namespace {
 
 // File name of the internal Flash plugin on different platforms.
 const FilePath::CharType kInternalFlashPluginFileName[] =
 #if defined(OS_MACOSX)
@@ skipping 97 matching lines @@
       return PathService::Get(base::FILE_MODULE, result);
   }
 
   // Assume that we will not need to create the directory if it does not exist.
   // This flag can be set to true for the cases where we want to create it.
   bool create_dir = false;
 
   FilePath cur;
   switch (key) {
     case chrome::DIR_USER_DATA:
+      CHECK(ProcessNeedsProfileDir(
+          CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+              switches::kProcessType)));
       if (!GetDefaultUserDataDirectory(&cur)) {
         NOTREACHED();
         return false;
       }
       create_dir = true;
       break;
     case chrome::DIR_USER_DOCUMENTS:
       if (!GetUserDocumentsDirectory(&cur))
         return false;
       create_dir = true;
@@ skipping 286 matching lines @@
   return true;
 }
 
 // This cannot be done as a static initializer sadly since Visual Studio will
 // eliminate this object file if there is no direct entry point into it.
 void RegisterPathProvider() {
   PathService::RegisterProvider(PathProvider, PATH_START, PATH_END);
 }
 
 }  // namespace chrome