Roll src/third_party/expat/src/ 25d3c190c..63abbcdb3 (4 commits)

https://chromium.googlesource.com/external/github.com/libexpat/libexpat.git/+log/25d3c190c69e..63abbcdb3b74

$ git log 25d3c190c..63abbcdb3 --date=short --no-merges --format='%ad %ae %s'
2019-11-18 bhargava.shastry CMake: Enable oss-fuzz integration
2019-11-17 bhargava.shastry parsebuffer fuzzer: Bail out on empty fuzzer input
2019-11-04 luzpaz Fix source comment typos
2019-10-26 sebastian xmlparse.c: Improve warning regarding lack of high quality entropy (#172)

Created with:
  roll-dep src/third_party/expat/src
R=bungeman@chromium.org,dcheng@chromium.org

Change-Id: I3601728881f639c6109607993e508ff5eda9a785
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1931537Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Ben Wagner <bungeman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719156}

DEPS

@@ -315,7 +315,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libexpat
   # and whatever else without interference from each other.
-  'libexpat_revision': '25d3c190c69ea7f98e2826f901fd9e28b6f7f3fd',
+  'libexpat_revision': '63abbcdb3b743049bb3ee9e962a3280a3dad4191',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling wuffs
   # and whatever else without interference from each other.

third_party/expat/README.chromium

 Name: Expat XML Parser
 Short Name: expat
 URL: https://github.com/libexpat/libexpat
-Version: R_2_2_9-38-g25d3c19
-Date: 20191016
-Revision: 25d3c190c69ea7f98e2826f901fd9e28b6f7f3fd
+Version: R_2_2_9-45-g63abbcd
+Date: 20191122
+Revision: 63abbcdb3b743049bb3ee9e962a3280a3dad4191
 Security Critical: yes
 License: MIT
 License File: src/expat/COPYING