Roll libc++ from c2c181276adb to cc6b969c59a7 (4 revisions)

c2c181276a..cc6b969c59

2025-02-14 koraq@xs4all.nl [NFC][libc++][format] Fixes comment typos.
2025-02-14 koraq@xs4all.nl [libc++][format] Disables the FTM on older MacOS versions. (#126547)
2025-02-14 hghristov.rmm@gmail.com [libc++][NFC] Add reminder to remove _LIBCPP_HAS_EXPLICIT_THIS_PARAMETER macro (#127070)
2025-02-14 nikolasklauser@berlin.de [libc++][NFC] Simplify unique_ptr a bit (#121230)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/libcxx-chromium
Please CC hans@chromium.org,thakis@chromium.org on the revert to ensure that a human
is aware of the problem.

To file a bug in Chromium: https://bugs.chromium.org/p/chromium/issues/entry

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Tbr: hans@chromium.org,thakis@chromium.org
Change-Id: If848444052d3aa59d50ada3545cded0025d76d8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6272655
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1420839}

DEPS

@@ -496,7 +496,7 @@ vars = {
 
   # If you change this, also update the libc++ revision in
   # //buildtools/deps_revisions.gni.
-  'libcxx_revision':       'c2c181276adb33a05d47c90637bd04a9ca650ebe',
+  'libcxx_revision':       'cc6b969c59a79b15713b40c4231aa09c9ac70433',
 
   # GN CIPD package version.
   'gn_version': 'git_revision:ed1abc107815210dc66ec439542bee2f6cbabc00',

buildtools/deps_revisions.gni

@@ -5,5 +5,5 @@
 declare_args() {
   # Used to cause full rebuilds on libc++ rolls. This should be kept in sync
   # with the libcxx_revision var in //DEPS.
-  libcxx_revision = "c2c181276adb33a05d47c90637bd04a9ca650ebe"
+  libcxx_revision = "cc6b969c59a79b15713b40c4231aa09c9ac70433"
 }