Remove base::is_trivially_destructible and use the standard library.

base/optional_unittest.cc

 // Copyright 2016 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 "base/optional.h"
 
 #include <set>
 
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 71 matching lines @@
 void swap(TestObject& lhs, TestObject& rhs) {
   lhs.Swap(&rhs);
 }
 
 class NonTriviallyDestructible {
   ~NonTriviallyDestructible() {}
 };
 
 }  // anonymous namespace
 
-static_assert(is_trivially_destructible<Optional<int>>::value,
+static_assert(std::is_trivially_destructible<Optional<int>>::value,
               "OptionalIsTriviallyDestructible");
 
 static_assert(
-    !is_trivially_destructible<Optional<NonTriviallyDestructible>>::value,
+    !std::is_trivially_destructible<Optional<NonTriviallyDestructible>>::value,
     "OptionalIsTriviallyDestructible");
 
 TEST(OptionalTest, DefaultConstructor) {
   {
     constexpr Optional<float> o;
     EXPECT_FALSE(o);
   }
 
   {
     Optional<std::string> o;
@@ skipping 1230 matching lines @@
 
 TEST(OptionalTest, Reset_NoOp) {
   Optional<int> a;
   EXPECT_FALSE(a.has_value());
 
   a.reset();
   EXPECT_FALSE(a.has_value());
 }
 
 }  // namespace base