Changes imported from Abseil "staging" branch:

- 53eebc8dc5730f42b1cda71bc55a5097d330b484 This changes the value base_internal::kOnceDone from 32-b... by Abseil Team <absl-team@google.com>
  - e34af839e2062e9ed6639803186811be23e6fb80 This changes the value base_internal::kOnceDone from 32-b... by Abseil Team <absl-team@google.com>
  - dfb395ba062168eeb15237724b628a1b2494052c Remove unnecessary dependency. by Abseil Team <absl-team@google.com>

GitOrigin-RevId: 53eebc8dc5730f42b1cda71bc55a5097d330b484
Change-Id: Ide088c81d660c4be900b2456d57a8dcbdb349cc7

absl/synchronization/BUILD.bazel

@@ -204,5 +204,6 @@ cc_test(
     deps = [
         ":synchronization",
         "//absl/base",
+        "//absl/base:core_headers",
     ],
 )

absl/types/BUILD.bazel

@@ -92,7 +92,6 @@ cc_library(
         "//absl/base:core_headers",
         "//absl/base:throw_delegate",
         "//absl/meta:type_traits",
-        "//absl/strings",
     ],
 )