Roll src/third_party/googletest/src/ 8b6d3f9c4..a18ac392d (6 commits)

https://chromium.googlesource.com/external/github.com/google/googletest.git/+log/8b6d3f9c4a77..a18ac392d883

$ git log 8b6d3f9c4..a18ac392d --date=short --no-merges --format='%ad %ae %s'
2019-03-21 gennadiycivil Update googletest/docs/advanced.md
2019-03-19 absl-team Googletest export
2019-03-18 absl-team Googletest export
2019-03-21 michael.thenault Note about INSTANTIATE_TEST_SUITE_P / INSTANTIATE_TEST_CASE_P  keyword change
2019-03-15 Tobias_Mueller Remove old_crtdbg_flag_ member if not required
2019-03-15 seth.raymond DesignDoc Markdown table was broken

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

Change-Id: Ie5d4ac4e1a4a9af5a374dbfd9d1af8e1f9d629e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1537377
Commit-Queue: Victor Costan <pwnall@chromium.org>
Auto-Submit: Staphany Park <staphany@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#643717}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: e9ee000afa3274ff9dcca5688a98cb72bd6a0caf
diff --git a/README.chromium b/README.chromium
index 19b0ed7..e70e558 100644
--- a/README.chromium
+++ b/README.chromium
@@ -1,7 +1,7 @@
 Name: Google Test: Google's C++ Testing Framework
 Short Name: googletest
 URL: https://github.com/google/googletest.git
-Version: 8b6d3f9c4a774bef3081195d422993323b6bb2e0
+Version: a18ac392d883ca88d1849b90071cea5608fd9293
 License: BSD
 License File: NOT_SHIPPED
 Security critical: no