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

chrome/browser/extensions/api/web_request/web_request_api_unittest.cc

Index: chrome/browser/extensions/api/web_request/web_request_api_unittest.cc
diff --git a/chrome/browser/extensions/api/web_request/web_request_api_unittest.cc b/chrome/browser/extensions/api/web_request/web_request_api_unittest.cc
index a3c4a1f142f788bb0950283e9bacbb3f2df449c8..5ee161ff3574aba5e662155278c7d46f254612c8 100644
--- a/chrome/browser/extensions/api/web_request/web_request_api_unittest.cc
+++ b/chrome/browser/extensions/api/web_request/web_request_api_unittest.cc
@@ -7,6 +7,7 @@
 
 #include <map>
 #include <queue>
+#include <tuple>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ -127,9 +128,9 @@ void GetPartOfMessageArguments(IPC::Message* message,
                                ExtensionMsg_MessageInvoke::Param* param) {
   ASSERT_EQ(ExtensionMsg_MessageInvoke::ID, message->type());
   ASSERT_TRUE(ExtensionMsg_MessageInvoke::Read(message, param));
-  ASSERT_GE(base::get<3>(*param).GetSize(), 2u);
+  ASSERT_GE(std::get<3>(*param).GetSize(), 2u);
   const base::Value* value = NULL;
-  ASSERT_TRUE(base::get<3>(*param).Get(1, &value));
+  ASSERT_TRUE(std::get<3>(*param).Get(1, &value));
   const base::ListValue* list = NULL;
   ASSERT_TRUE(value->GetAsList(&list));
   ASSERT_EQ(1u, list->GetSize());
@@ -1007,7 +1008,7 @@ TEST_P(ExtensionWebRequestHeaderModificationTest, TestModifications) {
       continue;
     ExtensionMsg_MessageInvoke::Param message_tuple;
     ExtensionMsg_MessageInvoke::Read(message, &message_tuple);
-    base::ListValue& args = base::get<3>(message_tuple);
+    base::ListValue& args = std::get<3>(message_tuple);
 
     std::string event_name;
     if (!args.GetString(0, &event_name) ||