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

chrome/browser/extensions/api/declarative_content/declarative_content_css_condition_tracker_unittest.cc

 // Copyright 2015 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/extensions/api/declarative_content/declarative_content_css_condition_tracker.h"
 
+#include <tuple>
+
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/test/values_test_util.h"
 #include "chrome/browser/extensions/api/declarative_content/content_predicate_evaluator.h"
 #include "chrome/browser/extensions/api/declarative_content/declarative_content_condition_tracker_test.h"
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/test/mock_render_process_host.h"
 #include "extensions/common/extension_messages.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 48 matching lines @@
                                const Func& func) {
     IPC::TestSink& sink = GetMockRenderProcessHost(tab)->sink();
     sink.ClearMessages();
     func();
     EXPECT_EQ(1u, sink.message_count());
     const IPC::Message* message =
         sink.GetUniqueMessageMatching(ExtensionMsg_WatchPages::ID);
     ASSERT_TRUE(message);
     ExtensionMsg_WatchPages::Param params;
     ExtensionMsg_WatchPages::Read(message, &params);
-    EXPECT_THAT(base::get<0>(params), UnorderedElementsAreArray(selectors));
+    EXPECT_THAT(std::get<0>(params), UnorderedElementsAreArray(selectors));
   }
 
   // Expects no ExtensionMsg_WatchPages message in |sink| after invoking |func|.
   template <class Func>
   void ExpectNoWatchPagesMessage(content::WebContents* tab,
                                  const Func& func) {
     IPC::TestSink& sink = GetMockRenderProcessHost(tab)->sink();
     sink.ClearMessages();
     func();
     EXPECT_EQ(0u, sink.message_count());
@@ skipping 237 matching lines @@
 TEST_F(DeclarativeContentCssConditionTrackerTest, WebContentsOutlivesTracker) {
   const scoped_ptr<content::WebContents> tab = MakeTab();
 
   {
     DeclarativeContentCssConditionTracker tracker(&delegate_);
     tracker_.TrackForWebContents(tab.get());
   }
 }
 
 }  // namespace extensions