Update google_benchmark

Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/9e859f5..acd7562

Refine the User Guide CPU Frequency Scaling section (#1331) (Matt Armstrong)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/acd7562

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

Change-Id: I49f0df390c6f06d810e942e67193b3ef83632080
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3411771
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DEPS

@@ -223,7 +223,7 @@ deps = {
     'condition': 'checkout_fuchsia',
   },
   'third_party/google_benchmark/src': {
-    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + '9e859f5bf55073a2b4c785b97b9cb78cbdaf127e',
+    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + 'acd75620347618dcf73e9d18474f110db63b97d4',
   },
   'third_party/googletest/src':
     Var('chromium_url') + '/external/github.com/google/googletest.git' + '@' + '100f6fbf5f81a82d163c1e29735e8a2936eacd4f',