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

chrome/browser/apps/app_shim/app_shim_host_mac_unittest.cc

Index: chrome/browser/apps/app_shim/app_shim_host_mac_unittest.cc
diff --git a/chrome/browser/apps/app_shim/app_shim_host_mac_unittest.cc b/chrome/browser/apps/app_shim/app_shim_host_mac_unittest.cc
index 16f1ac456c57a130887f8e211b04b23db734f370..b4c25c966b0a66694f55a8a40b593b3a6d81a45f 100644
--- a/chrome/browser/apps/app_shim/app_shim_host_mac_unittest.cc
+++ b/chrome/browser/apps/app_shim/app_shim_host_mac_unittest.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/apps/app_shim/app_shim_host_mac.h"
 
+#include <tuple>
 #include <vector>
 
 #include "base/macros.h"
@@ -74,7 +75,7 @@ class AppShimHostTest : public testing::Test,
     EXPECT_EQ(AppShimMsg_LaunchApp_Done::ID, message->type());
     AppShimMsg_LaunchApp_Done::Param param;
     AppShimMsg_LaunchApp_Done::Read(message, &param);
-    return base::get<0>(param);
+    return std::get<0>(param);
   }
 
   void SimulateDisconnect() {