Zygote most of the uses of the utility process on Linux

chrome/browser/extensions/sandboxed_extension_unpacker.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/browser/extensions/sandboxed_extension_unpacker.h"
 
 #include <set>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 243 matching lines @@
   ReportFailure(
      UTILITY_PROCESS_CRASHED_WHILE_TRYING_TO_INSTALL,
      l10n_util::GetStringFUTF8(
          IDS_EXTENSION_PACKAGE_INSTALL_ERROR,
          ASCIIToUTF16("UTILITY_PROCESS_CRASHED_WHILE_TRYING_TO_INSTALL")));
 }
 
 void SandboxedExtensionUnpacker::StartProcessOnIOThread(
     const FilePath& temp_crx_path) {
   UtilityProcessHost* host = new UtilityProcessHost(this, thread_identifier_);
+  // Don't launch the utility process from the zygote on Linux since
+  // extension unpacking needs FS access.
+  host->set_use_linux_zygote(false);
   // Grant the subprocess access to the entire subdir the extension file is
   // in, so that it can unpack to that dir.
   host->set_exposed_dir(temp_crx_path.DirName());
   host->Send(
       new ChromeUtilityMsg_UnpackExtension(
           temp_crx_path, location_, creation_flags_));
 }
 
 void SandboxedExtensionUnpacker::OnUnpackExtensionSucceeded(
     const DictionaryValue& manifest) {
@@ skipping 439 matching lines @@
           ERROR_SAVING_CATALOG,
           l10n_util::GetStringFUTF8(
               IDS_EXTENSION_PACKAGE_INSTALL_ERROR,
               ASCIIToUTF16("ERROR_SAVING_CATALOG")));
       return false;
     }
   }
 
   return true;
 }