Roll googletest to 1.7.0+.

build/secondary/testing/gtest/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.
 
+# Chromium's GN configuration for gtest now lives at testing/gtest/BUILD.gn.
+#
+# This configuration is left in the tree because it is pulled by V8 and PDFium,
+# and will be removed as soon as the projects switch off of it.
+#
+# Details at http://crbug.com/630705 and http://crrev.com/2779193002
+
 import("//build_overrides/gtest.gni")
 if (is_ios) {
   import("//build/config/ios/ios_sdk.gni")
   import("//build/buildflag_header.gni")
 }
 
 config("gtest_config") {
   visibility = [
     ":*",
     "//testing/gmock:*",  # gmock also shares this config.
@@ skipping 119 matching lines @@
     ":gtest",
   ]
 }
 
 if (is_ios) {
   buildflag_header("ios_enable_coverage") {
     header = "ios_enable_coverage.h"
     flags = [ "IOS_ENABLE_COVERAGE=$ios_enable_coverage" ]
   }
 }