Add a feature flag for network service and about:flags entry for it.

content/browser/utility_process_host_impl.cc

 // Copyright (c) 2012 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/utility_process_host_impl.h"
 
 #include <utility>
 
 #include "base/base_switches.h"
 #include "base/bind.h"
@@ skipping 272 matching lines @@
         NOTREACHED() << "Unable to get utility process binary name.";
         return false;
       }
 
       std::unique_ptr<base::CommandLine> cmd_line =
           base::MakeUnique<base::CommandLine>(exe_path);
     #endif
 
     cmd_line->AppendSwitchASCII(switches::kProcessType,
                                 switches::kUtilityProcess);
+    BrowserChildProcessHostImpl::CopyFeatureAndFieldTrialFlags(cmd_line.get());
     std::string locale = GetContentClient()->browser()->GetApplicationLocale();
     cmd_line->AppendSwitchASCII(switches::kLang, locale);
 
 #if defined(OS_WIN)
     cmd_line->AppendArg(switches::kPrefetchArgumentOther);
 #endif  // defined(OS_WIN)
 
     if (no_sandbox_)
       cmd_line->AppendSwitch(switches::kNoSandbox);
 
     // Browser command-line switches to propagate to the utility process.
     static const char* const kSwitchNames[] = {
-      switches::kEnableNetworkService,
       switches::kHostResolverRules,
       switches::kLogNetLog,
       switches::kNoSandbox,
       switches::kProfilerTiming,
       switches::kProxyServer,
 #if defined(OS_MACOSX)
       switches::kEnableSandboxLogging,
 #endif
       switches::kUseFakeDeviceForMediaStream,
       switches::kUseFileForFakeVideoCapture,
@@ skipping 78 matching lines @@
     base::WeakPtr<UtilityProcessHostImpl> host,
     int error_code) {
   if (!host)
     return;
 
   host->OnProcessLaunchFailed(error_code);
   delete host.get();
 }
 
 }  // namespace content