M64: Roll FreeType to ff72e3b1.

https://chromium.googlesource.com/chromium/src/third_party/freetype2.git/+log/bec14f68..ff72e3b1

ff72e3b1 [psaux] Correctly handle Flex features (#52846).

Note: This only affects standalone PDFium and has no effect on Chromium.

BUG=chromium:810166
TBR=bungeman@chromium.org

Change-Id: Ifa5be56638a1b95b2158b9c9498d28cfac5b9011
Reviewed-on: https://pdfium-review.googlesource.com/27610
Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index d66a423..80b4112 100644
--- a/DEPS
+++ b/DEPS
@@ -10,7 +10,7 @@
   'catapult_revision': '0cf3924bab2c2f66a412edda35f6e3572bd57623',
   'clang_revision': '4db585405687222660050d58eb12784fe0852884',
   'cygwin_revision': 'c89e446b273697fadf3a10ff1007a97c0b7de6df',
-  'freetype_revision': 'bec14f688925467be708f01378fbbf82e6b19b42',
+  'freetype_revision': 'ff72e3b173da2ee172c0007b67693c50f0b628e8',
   'gmock_revision': '29763965ab52f24565299976b936d1265cb6a271',
   'gtest_revision': '8245545b6dc9c4703e6496d1efd19e975ad2b038',
   'icu_revision': '08cb956852a5ccdba7f9c941728bb833529ba3c6',