Remove outdated comment about updating Chromium sandbox definition

After https://crrev.com/c/7522927, this is no longer necessary.

Change-Id: I85014b6d81c3fa6ef75f936820d9f6ee67076211
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/88007
Auto-Submit: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: Adam Langley <agl@google.com>

crypto/cpu_aarch64_apple.cc

diff --git a/crypto/cpu_aarch64_apple.cc b/crypto/cpu_aarch64_apple.cc
index 4e8c661..c42ced4 100644
--- a/crypto/cpu_aarch64_apple.cc
+++ b/crypto/cpu_aarch64_apple.cc
@@ -63,9 +63,6 @@
   // available in macOS 12. For compatibility with macOS 11, we also support
   // the old names. The old names don't have values for features like FEAT_AES,
   // so instead we detect them statically above.
-  //
-  // If querying new sysctls, update the Chromium sandbox definition. See
-  // https://crrev.com/c/4415225.
   if (has_hw_feature("hw.optional.arm.FEAT_SHA512") ||
       has_hw_feature("hw.optional.armv8_2_sha512")) {
     OPENSSL_armcap_P |= ARMV8_SHA512;