Replace base::Tuple in //ppapi with std::tuple

ppapi/proxy/ppapi_proxy_test.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 "ppapi/proxy/ppapi_proxy_test.h"
 
 #include <sstream>
+#include <tuple>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/observer_list.h"
 #include "base/process/process_handle.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "ipc/ipc_sync_channel.h"
@@ skipping 119 matching lines @@
   EXPECT_TRUE(reply_msg);
   if (!reply_msg)
     return false;
 
   base::TupleTypes<PpapiMsg_SupportsInterface::ReplyParam>::ValueTuple
       reply_data;
   EXPECT_TRUE(PpapiMsg_SupportsInterface::ReadReplyParam(
       reply_msg, &reply_data));
 
   sink().ClearMessages();
-  return base::get<0>(reply_data);
+  return std::get<0>(reply_data);
 }
 
 // PluginProxyTestHarness ------------------------------------------------------
 
 PluginProxyTestHarness::PluginProxyTestHarness(
     GlobalsConfiguration globals_config)
     : globals_config_(globals_config) {
 }
 
 PluginProxyTestHarness::~PluginProxyTestHarness() {
@@ skipping 423 matching lines @@
 void TwoWayTest::PostTaskOnRemoteHarness(const base::Closure& task) {
   base::WaitableEvent task_complete(true, false);
   plugin_thread_.task_runner()->PostTask(
       FROM_HERE, base::Bind(&RunTaskOnRemoteHarness, task, &task_complete));
   task_complete.Wait();
 }
 
 
 }  // namespace proxy
 }  // namespace ppapi