mojo/public: Include gtest.h as "gtest/gtest.h", instead of via "absolute" path.

mojo/public/cpp/bindings/tests/interface_unittest.cc

 // Copyright 2015 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 <memory>
 
+#include "gtest/gtest.h"
 #include "mojo/public/interfaces/bindings/tests/sample_interfaces.mojom.h"
-#include "testing/gtest/include/gtest/gtest.h"
 
 using sample::SampleInterface;
 using sample::SampleInterface_SampleMethod1_Params;
 using sample::SampleInterface_SampleMethod1_ResponseParams;
 
 namespace mojo {
 namespace test {
 namespace {
 
 // Test the validity of the generated ordinals for interface methods.
@@ skipping 50 matching lines @@
   auto* params_data = reinterpret_cast<
       sample::internal::SampleInterface_SampleMethod1_ResponseParams_Data*>(
       bytes.get());
   EXPECT_EQ(0UL, params_data->out1.offset);
   EXPECT_EQ(sample::Enum::VALUE, static_cast<sample::Enum>(params_data->out2));
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo