Roll src/third_party/re2/src/ e9d517989..e6613e91b (3 commits)

https://chromium.googlesource.com/external/github.com/google/re2.git/+log/e9d517989f66..e6613e91b26e

$ git log e9d517989..e6613e91b --date=short --no-merges --format='%ad %ae %s'
2020-06-16 junyer Distinguish between missing ')' and unexpected ')'.
2020-06-16 junyer Make RE2::Set and FilteredRE2 movable.
2020-06-15 junyer Herp derp. It's actually constant-time append.

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

R=thakis@chromium.org
CC=mmoroz@chromium.org

Change-Id: Idda604a248dd85373905c069aa0db96b9a6c396b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250476
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779815}

DEPS

@@ -1321,7 +1321,7 @@ deps = {
   },
 
   'src/third_party/re2/src':
-    Var('chromium_git') + '/external/github.com/google/re2.git' + '@' + 'e9d517989f66f2e0a24cde42f4d2424dd3e4a9b9',
+    Var('chromium_git') + '/external/github.com/google/re2.git' + '@' + 'e6613e91b26e84b7e7f4d763ebbd0ff336be2fc1',
 
   'src/third_party/r8': {
       'packages': [