Roll googletest to 1.8.0.

third_party/googletest/README.chromium

Index: third_party/googletest/README.chromium
diff --git a/third_party/googletest/README.chromium b/third_party/googletest/README.chromium
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+Name: Google Test: Google's C++ Testing Framework
+Short Name: googletest
+URL: https://github.com/google/googletest.git
+Version: 1.8.0
+License: BSD
+Security critical: no
+
+Google Test is imported as-is, to facilitate version bumping. However, the
+file/directory layout of Google Test is not yet considered stable. Therefore,
+until Google Test's layout stabilizes, Chromium code MUST NOT depend on it
+directly. Instead, Chromium code MUST:
+
+* #include the headers in testing/gtest and testing/gmock
+* use //testing/gtest(:gtest_main) and //testing/gmock(:gmock_main) in BUILD.gn
+  deps
+
+This will allow us to adapt to Google Test changes with minimal disruption.