Roll Zlib from 956936c53cb6 to 646b7f569718 (3 revisions)

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Bug: None
Change-Id: Ic76935ae7e36a0e443ce740dc7d93161e438452f
Bot-Commit: pdfium-autoroll <>
Commit-Queue: pdfium-autoroll <>
diff --git a/DEPS b/DEPS
index e87cef8..ba2b452 100644
--- a/DEPS
+++ b/DEPS
@@ -214,7 +214,7 @@
   # 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': '956936c53cb6169f2b97e009bfaefd66da227ab6',
+  'zlib_revision': '646b7f569718921d7d4b5b8e22572ff6c76f2596',
 # Only these hosts are allowed for dependencies in this DEPS file.