Roll src/third_party/re2/src/ ca93436e5..ac65d4531 (7 commits)

https://chromium.googlesource.com/external/github.com/google/re2.git/+log/ca93436e5b1b..ac65d4531798

$ git log ca93436e5..ac65d4531 --date=short --no-merges --format='%ad %ae %s'
2020-04-09 junyer Remove deprecated APIs. Bump SONAME accordingly.
2020-04-06 junyer Go back to using __builtin_ctzll(). Sigh.
2020-04-05 junyer Return the fanout histogram in a vector, not a map.
2020-04-05 junyer Optimise fanout bucketing.
2020-04-05 junyer Add Clang 10 to the Travis CI matrix.
2020-03-27 junyer Aiieee. Add a missing underscore.
2020-03-27 junyer Include the pattern length in "DFA out of memory" errors.

Created with:
  roll-dep src/third_party/re2/src

R=mmoroz@chromium.org

Change-Id: I60964941fd6cb319f2c497d579cf8609bfbb7e74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2154810
Commit-Queue: Paul Wankadia <junyer@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760112}

DEPS

@@ -1314,7 +1314,7 @@ deps = {
   },
 
   'src/third_party/re2/src':
-    Var('chromium_git') + '/external/github.com/google/re2.git' + '@' + 'ca93436e5b1be02f9f4bfca79b8202c400161994',
+    Var('chromium_git') + '/external/github.com/google/re2.git' + '@' + 'ac65d4531798ffc9bf807d1f7c09efb0eec70480',
 
   'src/third_party/r8': {
       'packages': [