Support abseil component build for private_membership

Previously, private_membership was depending on specific
targets in abseil before facilitating the component build for it.
Now, it can directly depend on its component build.

Bug: 1094745
Change-Id: I1c4e57fa1686c899fe5cfb49423ad033e0f40d58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2245613Reviewed-by: Amr Aboelkher <amraboelkher@google.com>
Reviewed-by: Amr Aboelkher <amraboelkher@chromium.org>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Commit-Queue: Amr Aboelkher <amraboelkher@google.com>
Cr-Commit-Position: refs/heads/master@{#791449}

third_party/private_membership/BUILD.gn

@@ -67,12 +67,7 @@ source_set("private_membership") {
   public_deps = [
     ":private_membership_proto",
     "//base",
-    "//third_party/abseil-cpp/absl/container:flat_hash_map",
-    "//third_party/abseil-cpp/absl/hash",
-    "//third_party/abseil-cpp/absl/memory",
-    "//third_party/abseil-cpp/absl/numeric:int128",
-    "//third_party/abseil-cpp/absl/status",
-    "//third_party/abseil-cpp/absl/strings",
+    "//third_party/abseil-cpp:absl",
     "//third_party/boringssl",
     "//third_party/private-join-and-compute/src:ec_commutative_cipher",
     "//third_party/shell-encryption:shell_encryption",