Roll third_party/zlib/ 8f2b9d41f..abd51836c (4 commits)

https://chromium.googlesource.com/chromium/src/third_party/zlib.git/+log/8f2b9d41fbd3..abd51836c6da

$ git log 8f2b9d41f..abd51836c --date=short --no-merges --format='%ad %ae %s'
2019-06-24 tsniatowski zlib: fix gn error when is_clang=false target_cpu="arm"
2019-06-11 scroggo Simplify sharing third_party/zlib with AOSP
2019-06-10 jose.dapena zlib: fix ARMv8 CRC32 compilation in GCC
2019-05-14 huangs [DOM Distiller] Compress resources to save 86 kB on Android.

Created with:
  roll-dep third_party/zlib

TBR=tsepez@chromium.org

Change-Id: I183465cb6957042128dfde17697367ba1c1dc1d5
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/57371
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index f483afe..d2f98c6 100644
--- a/DEPS
+++ b/DEPS
@@ -33,7 +33,7 @@
   'trace_event_revision': '936ba8a963284a6b3737cf2f0474a7131073abee',
   'v8_revision': 'c4c480a413d23f62301e839970be1378c2c7f1f0',
   'yasm_source_revision': '720b70524a4424b15fc57e82263568c8ba0496ad',
-  'zlib_revision': '8f2b9d41fbd341ab8ceaa726fb544bd72afd9b82',
+  'zlib_revision': 'abd51836c6dad6c460d236fff70f28cc578a1336',
 
   # GN CIPD package version.
   'gn_version': 'git_revision:0790d3043387c762a6bacb1ae0a9ebe883188ab2',