Roll third_party/zlib/ a6d209ab9..e53d3f018 (15 commits)

https://chromium.googlesource.com/chromium/src/third_party/zlib.git/+log/a6d209ab932d..e53d3f018a7d

Created with:
  roll-dep third_party/zlib

Change-Id: I0ac017059a009e3477c2adc46a1e8dfffe92e8b1
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/93270
Commit-Queue: Nigi <nigi@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index 2f082c9..efabdd5 100644
--- a/DEPS
+++ b/DEPS
@@ -143,7 +143,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling zlib
   # and whatever else without interference from each other.
-  'zlib_revision': 'a6d209ab932df0f1c9d5b7dc67cfa74e8a3272c0',
+  'zlib_revision': 'e53d3f018a7d98811fae1cd0af05a3aefbd9430d',
 }
 
 # Only these hosts are allowed for dependencies in this DEPS file.