Update legacy Tuple-using code.

chrome/browser/ui/search/instant_search_prerenderer_unittest.cc

 // Copyright 2013 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/ui/search/instant_search_prerenderer.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/field_trial.h"
@@ skipping 483 matching lines @@
   GURL url("https://www.google.com/url?bar=foo&aqs=chrome...0&ie=utf-8&oq=f");
   browser()->instant_controller()->OpenInstant(CURRENT_TAB, url);
   content::MockRenderProcessHost* process =
       static_cast<content::MockRenderProcessHost*>(
           prerender_contents()->GetRenderViewHost()->GetProcess());
   const IPC::Message* message = process->sink().GetFirstMessageMatching(
       ChromeViewMsg_SearchBoxSubmit::ID);
   ASSERT_TRUE(message);
 
   // Verify the IPC message params.
-  Tuple2<base::string16, EmbeddedSearchRequestParams> params;
+  Tuple<base::string16, EmbeddedSearchRequestParams> params;
   ChromeViewMsg_SearchBoxSubmit::Read(message, &params);
-  EXPECT_EQ("foo", base::UTF16ToASCII(params.a));
-  EXPECT_EQ("f", base::UTF16ToASCII(params.b.original_query));
-  EXPECT_EQ("utf-8", base::UTF16ToASCII(params.b.input_encoding));
-  EXPECT_EQ("", base::UTF16ToASCII(params.b.rlz_parameter_value));
-  EXPECT_EQ("chrome...0", base::UTF16ToASCII(params.b.assisted_query_stats));
+  EXPECT_EQ("foo", base::UTF16ToASCII(get<0>(params)));
+  EXPECT_EQ("f", base::UTF16ToASCII(get<1>(params).original_query));
+  EXPECT_EQ("utf-8", base::UTF16ToASCII(get<1>(params).input_encoding));
+  EXPECT_EQ("", base::UTF16ToASCII(get<1>(params).rlz_parameter_value));
+  EXPECT_EQ("chrome...0",
+            base::UTF16ToASCII(get<1>(params).assisted_query_stats));
 }
 #endif