Update legacy Tuple-using code.

content/renderer/pepper/pepper_file_chooser_host_unittest.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 "base/files/file_path.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/common/view_messages.h"
 #include "content/public/common/file_chooser_file_info.h"
 #include "content/public/common/file_chooser_params.h"
 #include "content/public/test/render_view_test.h"
@@ skipping 73 matching lines @@
   int32 result = chooser.OnResourceMessageReceived(show_msg, &context);
   EXPECT_EQ(PP_OK_COMPLETIONPENDING, result);
 
   // The render view should have sent a chooser request to the browser
   // (caught by the render thread's test message sink).
   const IPC::Message* msg = render_thread_->sink().GetUniqueMessageMatching(
       ViewHostMsg_RunFileChooser::ID);
   ASSERT_TRUE(msg);
   ViewHostMsg_RunFileChooser::Schema::Param call_msg_param;
   ASSERT_TRUE(ViewHostMsg_RunFileChooser::Read(msg, &call_msg_param));
-  const FileChooserParams& chooser_params = call_msg_param.a;
+  const FileChooserParams& chooser_params = get<0>(call_msg_param);
 
   // Basic validation of request.
   EXPECT_EQ(FileChooserParams::Open, chooser_params.mode);
   ASSERT_EQ(1u, chooser_params.accept_types.size());
   EXPECT_EQ(accept[0], base::UTF16ToUTF8(chooser_params.accept_types[0]));
 
   // Send a chooser reply to the render view. Note our reply path has to have a
   // path separator so we include both a Unix and a Windows one.
   content::FileChooserFileInfo selected_info;
   selected_info.display_name = FILE_PATH_LITERAL("Hello, world");
@@ skipping 11 matching lines @@
   ASSERT_TRUE(host.sink().GetFirstResourceReplyMatching(
       PpapiPluginMsg_FileChooser_ShowReply::ID, &reply_params, &reply_msg));
 
   // Basic validation of reply.
   EXPECT_EQ(call_params.sequence(), reply_params.sequence());
   EXPECT_EQ(PP_OK, reply_params.result());
   PpapiPluginMsg_FileChooser_ShowReply::Schema::Param reply_msg_param;
   ASSERT_TRUE(
       PpapiPluginMsg_FileChooser_ShowReply::Read(&reply_msg, &reply_msg_param));
   const std::vector<ppapi::FileRefCreateInfo>& chooser_results =
-      reply_msg_param.a;
+      get<0>(reply_msg_param);
   ASSERT_EQ(1u, chooser_results.size());
   EXPECT_EQ(FilePathToUTF8(selected_info.display_name),
             chooser_results[0].display_name);
 }
 
 TEST_F(PepperFileChooserHostTest, NoUserGesture) {
   PP_Resource pp_resource = 123;
 
   MockRendererPpapiHost host(view_, pp_instance());
   PepperFileChooserHost chooser(&host, pp_instance(), pp_resource);
 
   // Say there's no user gesture.
   host.set_has_user_gesture(false);
 
   std::vector<std::string> accept;
   accept.push_back("text/plain");
   PpapiHostMsg_FileChooser_Show show_msg(false, false, std::string(), accept);
 
   ppapi::proxy::ResourceMessageCallParams call_params(pp_resource, 0);
   ppapi::host::HostMessageContext context(call_params);
   int32 result = chooser.OnResourceMessageReceived(show_msg, &context);
   EXPECT_EQ(PP_ERROR_NO_USER_GESTURE, result);
 }
 
 }  // namespace content