Update gtest to 786564fa4a3c, switch to googlemock in gtest

base/guid_unittest.cc

 // Copyright (c) 2012 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.
 
 #include "base/guid.h"
 
 #include <limits>
 
 #include "base/strings/string_util.h"
-#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/gtest/googletest/include/gtest/gtest.h"
 
 namespace base {
 
 #if defined(OS_POSIX)
 
 namespace {
 
 bool IsGUIDv4(const std::string& guid) {
   // The format of GUID version 4 must be xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx,
   // where y is one of [8, 9, A, B].
@@ skipping 36 matching lines @@
     EXPECT_EQ(36U, guid2.length());
     EXPECT_NE(guid1, guid2);
 #if defined(OS_POSIX)
     EXPECT_TRUE(IsGUIDv4(guid1));
     EXPECT_TRUE(IsGUIDv4(guid2));
 #endif
   }
 }
 
 }  // namespace base