Roll src/third_party/re2/src/ a5548b3d5..7c2e104ff (8 commits)

https://chromium.googlesource.com/external/github.com/google/re2.git/+log/a5548b3d5782..7c2e104ffbe4

$ git log a5548b3d5..7c2e104ff --date=short --no-merges --format='%ad %ae %s'
2020-10-08 junyer Refactor the RE2::Arg templates for readability.
2020-10-07 junyer Rename namespace internal to namespace re2_internal.
2020-10-07 junyer Address `-Wunused-parameter' warnings.
2020-10-07 junyer Add missing #include. Mea culpa.
2020-10-07 junyer Rework RE2::Arg with templates instead of macros.
2020-10-06 junyer Write `typename' in templates rather than `class'.
2020-09-27 junyer Fix some indentation.
2020-09-27 junyer Set BAZELISK_GITHUB_TOKEN.

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

R=thakis@chromium.org

Change-Id: I9586928913e614e57ed45e6b56b3d05ac66e0b1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2460974
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@{#815292}

DEPS

@@ -1351,7 +1351,7 @@ deps = {
   },
 
   'src/third_party/re2/src':
-    Var('chromium_git') + '/external/github.com/google/re2.git' + '@' + 'a5548b3d57822f9234b51a3b0d969b245bf82cf4',
+    Var('chromium_git') + '/external/github.com/google/re2.git' + '@' + '7c2e104ffbe4383a9d2933428d4bc104ff16cdb2',
 
   'src/third_party/r8': {
       'packages': [