Remove ContrastAdjust().

This post-processing increased the contrast of scaled-down features -
mainly lines and fonts, relative to the background. The effect does not
improved readability and in some cases makes the scaled-down version
look like a different document at a glance. Text that is normal
weight appears bold when scaled down in these cases.

Change-Id: I2544d45e2bcec25d6742d2a60c1316d8df08cce1
Reviewed-on: https://pdfium-review.googlesource.com/15471
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>
diff --git a/DEPS b/DEPS
index 772af7a..32e59c3 100644
--- a/DEPS
+++ b/DEPS
@@ -18,7 +18,7 @@
   'jinja2_revision': 'd34383206fa42d52faa10bb9931d6d538f3a57e0',
   'jpeg_turbo_revision': '7260e4d8b8e1e40b17f03fafdf1cd83296900f76',
   'markupsafe_revision': '8f45f5cfa0009d2a70589bcda0349b8cb2b72783',
-  'pdfium_tests_revision': 'ae1650f5459d720c866a8a4b74f58529f3efc4f1',
+  'pdfium_tests_revision': '3fcb05df32dd74f46b1ce68c957c0452bce404c0',
   'skia_revision': 'e0e20755f6c09b71038ced2bf4a00b4c4593f504',
   'tools_memory_revision': '427f10475e1a8d72424c29d00bf689122b738e5d',
   'trace_event_revision': '06294c8a4a6f744ef284cd63cfe54dbf61eea290',