Roll third_party/abseil-cpp/ 0764ad493..b7ad4e9ef (9 commits)

https://chromium.googlesource.com/chromium/src/third_party/abseil-cpp.git/+log/0764ad493e54..b7ad4e9effbc

Created with:
  roll-dep third_party/abseil-cpp

Change-Id: I96ca9d38e5ab15e4d1c9d482837d384afda52eba
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/115110
Commit-Queue: Andy Phan <andyphan@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index 35daf03..585178c 100644
--- a/DEPS
+++ b/DEPS
@@ -64,7 +64,7 @@
   # 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': '0764ad493e54a79c7e3e02fc3412ef55b4835b9e',
+  'abseil_revision': 'b7ad4e9effbc9a1eb4cc8f9c31bd8906d85f0281',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling android_toolchain
   # and whatever else without interference from each other.