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

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

 // Copyright 2016 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 "mojo/public/cpp/bindings/lib/synchronous_connector.h"
 
 #include <string.h>
+
 #include <string>
 #include <utility>
 
+#include "gtest/gtest.h"
 #include "mojo/public/cpp/bindings/lib/message_builder.h"
 #include "mojo/public/cpp/bindings/message.h"
-#include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace test {
 namespace {
 
 void AllocMessage(const std::string& text, Message* message) {
   size_t payload_size = text.length() + 1;  // Plus null terminator.
   MessageBuilder builder(1, payload_size);
   memcpy(builder.buffer()->Allocate(payload_size), text.c_str(), payload_size);
 
@@ skipping 40 matching lines @@
   // Close the other end of the pipe.
   pipe.handle1.reset();
 
   Message message;
   EXPECT_FALSE(connector0.BlockingRead(&message));
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo