Update google_benchmark

Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/6d50251..108ca84

fix typo in comment (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/108ca84

R=v8-waterfall-sheriff@grotations.appspotmail.com,mtv-sf-v8-sheriff@grotations.appspotmail.com,mlippautz@chromium.org

Change-Id: I091bbd6d668a0ebd949432c5307276b3b7fc8c68
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3694933
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DEPS

@@ -235,7 +235,7 @@ deps = {
     'dep_type': 'cipd',
   },
   'third_party/google_benchmark/src': {
-    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + '6d50251d8e6ed6b7f6eb1e12c558d2808fb4ddaa',
+    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + '108ca84820dc932957b75e6b31faa6c3cf0aa37a',
   },
   'third_party/googletest/src':
     Var('chromium_url') + '/external/github.com/google/googletest.git' + '@' + 'af29db7ec28d6df1c7f0f745186884091e602e07',