Update gtest to 786564fa4a3c, switch to googlemock in gtest

base/strings/string16_unittest.cc

 // Copyright 2013 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 <sstream>
 
 #include "base/strings/string16.h"
 
 #include "base/strings/utf_string_conversions.h"
-#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/gtest/googletest/include/gtest/gtest.h"
 
 namespace base {
 
 #if defined(WCHAR_T_IS_UTF32)
 
 // We define a custom operator<< for string16 so we can use it with logging.
 // This tests that conversion.
 TEST(String16Test, OutputStream) {
   // Basic stream test.
   {
@@ skipping 28 matching lines @@
            << surrogate_pair << "," << unterminated_surrogate;
 
     EXPECT_STREQ("\xef\xbf\xbd,\xef\xbf\xbd,\xf0\x90\x8c\x80z,\xef\xbf\xbds",
                  stream.str().c_str());
   }
 }
 
 #endif
 
 }  // namespace base