Upgrade to FreeType 2.7.1.

BUG=pdfium:601

Change-Id: I07756cd208cd2221802ff2d331f316b6618a41e0
Reviewed-on: https://pdfium-review.googlesource.com/3120
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>
diff --git a/DEPS b/DEPS
index 26f8c8e..83917d3 100644
--- a/DEPS
+++ b/DEPS
@@ -15,7 +15,7 @@
   'gtest_revision': '8245545b6dc9c4703e6496d1efd19e975ad2b038',
   'icu_revision': '73e24736676b4b438270fda44e5b2c83b49fdd80',
   'instrumented_lib_revision': '61065eb0db191f46bdea202e833f5cd1f1ecedcd',
-  'pdfium_tests_revision': 'd25a422ab03d6c3109370bc454c629575e969329',
+  'pdfium_tests_revision': '46cec65c6895ed37a9bf960ce341a5655c7519bf',
   'skia_revision': '90e3cd78991ef337dbd0023efb30ece864694308',
   'tools_memory_revision': '427f10475e1a8d72424c29d00bf689122b738e5d',
   'trace_event_revision': '06294c8a4a6f744ef284cd63cfe54dbf61eea290',