test: use testing::*tuple instead of std::tr1

googletest imports tuple into testing to allow for compatibility across
c++ versions where tuple may be in std::tr1 or std. this will fix
deprecation warnings under visual studio 2017 after googletest is
updated to contain the fix in:
https://github.com/google/googletest/issues/1111

Change-Id: If1b633222fcbe86adb0ab82fc0233b6699fe67b8
diff --git a/test/filterintra_test.cc b/test/filterintra_test.cc
index d2b2735..55c19a8 100644
--- a/test/filterintra_test.cc
+++ b/test/filterintra_test.cc
@@ -20,8 +20,8 @@
 
 namespace {
 
+using ::testing::tuple;
 using libaom_test::ACMRandom;
-using std::tr1::tuple;
 
 typedef void (*Predictor)(uint8_t *dst, ptrdiff_t stride, TX_SIZE tx_size,
                           const uint8_t *above, const uint8_t *left, int mode);
@@ -42,9 +42,9 @@
   virtual ~AV1FilterIntraPredTest() {}
   virtual void SetUp() {
     PredFuncMode funcMode = GET_PARAM(0);
-    predFuncRef_ = std::tr1::get<0>(funcMode);
-    predFunc_ = std::tr1::get<1>(funcMode);
-    mode_ = std::tr1::get<2>(funcMode);
+    predFuncRef_ = ::testing::get<0>(funcMode);
+    predFunc_ = ::testing::get<1>(funcMode);
+    mode_ = ::testing::get<2>(funcMode);
     txSize_ = GET_PARAM(1);
 
     alloc_ = new uint8_t[2 * MaxTxSize + 1];
@@ -107,7 +107,7 @@
 
 TEST_P(AV1FilterIntraPredTest, BitExactCheck) { RunTest(); }
 
-using std::tr1::make_tuple;
+using ::testing::make_tuple;
 
 const PredFuncMode kPredFuncMdArray[] = {
   make_tuple(&av1_filter_intra_predictor_c, &av1_filter_intra_predictor_sse4_1,