diff -up chromium-65.0.3325.146/base/optional.h.784732 chromium-65.0.3325.146/base/optional.h
--- chromium-65.0.3325.146/base/optional.h.784732	2018-03-07 13:40:00.103579631 -0500
+++ chromium-65.0.3325.146/base/optional.h	2018-03-07 13:41:08.950323996 -0500
@@ -9,6 +9,7 @@
 #include <utility>
 
 #include "base/logging.h"
+#include "base/template_util.h"
 
 namespace base {
 
@@ -106,7 +107,7 @@ struct OptionalStorageBase<T, true /* tr
 // compiler generated constexpr {copy,move} constructors). Note that
 // placement-new is prohibited in constexpr.
 template <typename T,
-          bool = std::is_trivially_copy_constructible<T>::value,
+          bool = is_trivially_copy_constructible<T>::value,
           bool = std::is_trivially_move_constructible<T>::value>
 struct OptionalStorage : OptionalStorageBase<T> {
   // This is no trivially {copy,move} constructible case. Other cases are
diff -up chromium-65.0.3325.146/base/template_util.h.784732 chromium-65.0.3325.146/base/template_util.h
--- chromium-65.0.3325.146/base/template_util.h.784732	2018-03-07 13:41:19.479131969 -0500
+++ chromium-65.0.3325.146/base/template_util.h	2018-03-07 13:42:41.308639551 -0500
@@ -10,6 +10,7 @@
 #include <iterator>
 #include <type_traits>
 #include <utility>
+#include <vector>
 
 #include "build/build_config.h"
 
@@ -127,6 +128,23 @@ template <class T>
 using is_trivially_copyable = std::is_trivially_copyable<T>;
 #endif
 
+#if defined(__GNUC__) && !defined(__clang__) && __GNUC__ <= 7
+// Workaround for g++7 and earlier family.
+// Due to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80654, without this
+// Optional<std::vector<T>> where T is non-copyable causes a compile error.
+// As we know it is not trivially copy constructible, explicitly declare so.
+template <typename T>
+struct is_trivially_copy_constructible
+    : std::is_trivially_copy_constructible<T> {};
+
+template <typename... T>
+struct is_trivially_copy_constructible<std::vector<T...>> : std::false_type {};
+#else
+// Otherwise use std::is_trivially_copy_constructible as is.
+template <typename T>
+using is_trivially_copy_constructible = std::is_trivially_copy_constructible<T>;
+#endif
+
 }  // namespace base
 
 #undef CR_USE_FALLBACKS_FOR_GCC_WITH_LIBCXX