Remove GTEST_LANG_CXX11 and switch to C++11 on gtest and gmock

build/secondary/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.
 
 config("gmock_config") {
   # Gmock headers need to be able to find themselves.
-  include_dirs = [ "include" ]
+  include_dirs = [
+    "//testing/gmock_custom",
+    "include",
+  ]
 }
 
 static_library("gmock") {
   testonly = true
   sources = [
     # Sources based on files in r173 of gmock.
     "include/gmock/gmock-actions.h",
     "include/gmock/gmock-cardinalities.h",
     "include/gmock/gmock-generated-actions.h",
     "include/gmock/gmock-generated-function-mockers.h",
@@ skipping 25 matching lines @@
 
 static_library("gmock_main") {
   testonly = true
   sources = [
     "src/gmock_main.cc",
   ]
   deps = [
     ":gmock",
   ]
 }