Revert 191420 "PPAPI: Remove threading options; it's always on"

trunk/src/content/browser/ppapi_plugin_process_host.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/ppapi_plugin_process_host.h"
 
 #include <string>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
@@ skipping 268 matching lines @@
   cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
 
   // These switches are forwarded to both plugin and broker pocesses.
   static const char* kCommonForwardSwitches[] = {
     switches::kVModule
   };
   cmd_line->CopySwitchesFrom(browser_command_line, kCommonForwardSwitches,
                              arraysize(kCommonForwardSwitches));
 
   if (!is_broker_) {
-    // TODO(vtl): Stop passing flash args in the command line, or windows is
+    // TODO(vtl): Stop passing flash args in the command line, on windows is
     // going to explode.
     static const char* kPluginForwardSwitches[] = {
+      switches::kDisablePepperThreading,
       switches::kDisableSeccompFilterSandbox,
 #if defined(OS_MACOSX)
       switches::kEnableSandboxLogging,
 #endif
       switches::kNoSandbox,
       switches::kPpapiFlashArgs,
       switches::kPpapiStartupDialog,
     };
     cmd_line->CopySwitchesFrom(browser_command_line, kPluginForwardSwitches,
                                arraysize(kPluginForwardSwitches));
@@ skipping 118 matching lines @@
   // sent_requests_ queue should be the one that the plugin just created.
   Client* client = sent_requests_.front();
   sent_requests_.pop();
 
   const ChildProcessData& data = process_->GetData();
   client->OnPpapiChannelOpened(channel_handle, base::GetProcId(data.handle),
                                data.id);
 }
 
 }  // namespace content