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

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

 // 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.
 
 #include <string.h>
+
 #include <type_traits>
 
+#include "gtest/gtest.h"
 #include "mojo/public/cpp/bindings/lib/fixed_buffer.h"
 #include "mojo/public/cpp/bindings/lib/validation_errors.h"
 #include "mojo/public/cpp/system/message_pipe.h"
 #include "mojo/public/interfaces/bindings/tests/test_structs.mojom.h"
-#include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace test {
 namespace {
 
 static_assert(std::is_same<std::underlying_type<ScopedConstants::EType>::type,
                            int32_t>::value,
               "The underlying type of mojom generated enums must be int32_t.");
 
 RectPtr MakeRect(int32_t factor = 1) {
@@ skipping 426 matching lines @@
 
     MultiVersionStructV0Ptr output =
         SerializeAndDeserialize<MultiVersionStructV0Ptr>(input.Pass());
     EXPECT_TRUE(output);
     EXPECT_TRUE(output->Equals(*expected_output));
   }
 }
 
 }  // namespace test
 }  // namespace mojo