Remove base::is_trivially_destructible and use the standard library.

base/optional_unittest.cc

Index: base/optional_unittest.cc
diff --git a/base/optional_unittest.cc b/base/optional_unittest.cc
index 83025e8bdad3590de2da4e565d88d0661053fdf8..8b9a1ae2a398bce722f1650147e013426cbccaca 100644
--- a/base/optional_unittest.cc
+++ b/base/optional_unittest.cc
@@ -89,11 +89,11 @@ class 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) {