Roll third_party/abseil-cpp/ 4cb960a03..6a7478b49 (9 commits)

https://chromium.googlesource.com/chromium/src/third_party/abseil-cpp.git/+log/4cb960a03f72..6a7478b49591

Created with:
  roll-dep third_party/abseil-cpp

Change-Id: I7d6775a51fa3fc45fa722e176d14a50433cc4118
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/103054
Auto-Submit: Nigi <nigi@chromium.org>
Reviewed-by: K. Moon <kmoon@chromium.org>
Commit-Queue: K. Moon <kmoon@chromium.org>
diff --git a/DEPS b/DEPS
index c43ff7e..538645d 100644
--- a/DEPS
+++ b/DEPS
@@ -34,7 +34,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling abseil
   # and whatever else without interference from each other.
-  'abseil_revision': '4cb960a03f72b61662b378a7dbc3d7c0d5ad98ef',
+  'abseil_revision': '6a7478b4959189b9655ee95d5764e084d215a3ff',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling android_ndk
   # and whatever else without interference from each other.