components: Replace base::Optional and friends with absl counterparts

This replaces:
- base::Optional -> absl::optional
- include "base/optional.h"
  ->
  include "third_party/abseil-cpp/absl/types/optional.h"
- base::nullopt -> absl::nullopt
- base::make_optional -> absl::make_optional

Bug: 1202909
Change-Id: If697b7bf69b199c1796f873eedca3359cdb48c64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2897151
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Owners-Override: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#883296}
NOKEYCHECK=True
GitOrigin-RevId: 1156b5f891de178171e71b9221a96bef1ced3d3b

1 files changed, 2 insertions, 2 deletions

diff --git a/disassembler.cc b/disassembler.cc
index 0411791..4a210ac 100644
--- a/disassembler.cc
+++ b/disassembler.cc
@@ -10,8 +10,8 @@ namespace zucchini {
 
 /******** EmptyReferenceReader ********/
 
-base::Optional<Reference> EmptyReferenceReader::GetNext() {
-  return base::nullopt;
+absl::optional<Reference> EmptyReferenceReader::GetNext() {
+  return absl::nullopt;
 }
 
 /******** EmptyReferenceWriter ********/