Roll googletest to 1.8.0.

testing/gmock/BUILD.gn

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("gmock") {
+  testonly = true
+  sources = [
+    "include/gmock/gmock-actions.h",
+    "include/gmock/gmock-generated-function-mockers.h",
+    "include/gmock/gmock-matchers.h",
+    "include/gmock/gmock.h",
+  ]
+  deps = [
+    "//third_party/googletest:gmock",
+  ]
+
+  public_configs = [
+    "//third_party/googletest:gmock_config",
+    "//third_party/googletest:gtest_config",
+  ]
+}
+
+source_set("gmock_main") {
+  testonly = true
+  deps = [
+    "//third_party/googletest:gmock_main",
+  ]
+}