Move the C bindings tests to the new location.

mojo/public/c/bindings/tests/testing_util.h

-// 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.
-
-#ifndef MOJO_PUBLIC_C_BINDINGS_TESTS_TESTING_UTIL_H_
-#define MOJO_PUBLIC_C_BINDINGS_TESTS_TESTING_UTIL_H_
-
-#include <mojo/bindings/buffer.h>
-#include <mojo/system/handle.h>
-#include <stddef.h>
-#include <stdint.h>
-#include <string.h>
-
-#include "testing/gtest/include/gtest/gtest.h"
-
-// This will copy the supplied |in_struct| and compare it against the new
-// copy, expecting them to be the same. It compares the encoded version to be
-// sure that they are the same, since a unencoded version will have pointers
-// pointing to separate objects in the two copies, whereas encoded versions will
-// only have relative offsets for pointers. The new copy will remain encoded,
-// and the original will be decoded.
-// This function won't work for structs with handles, and will crash.
-template <typename T>
-void CopyAndCompare(
-    MojomBuffer* buf,
-    T* in_struct,
-    size_t in_struct_size,
-    T* (*copy_fn)(struct MojomBuffer* in_buffer, T* in_struct),
-    void (*encode_fn)(T* inout_struct,
-                      uint32_t size,
-                      struct MojomHandleBuffer* inout_handle_buffer),
-    void (*decode_fn)(T* inout_struct,
-                      uint32_t size,
-                      MojoHandle* handles,
-                      uint32_t num_handles)) {
-  T* out_struct = copy_fn(buf, in_struct);
-  ASSERT_TRUE(out_struct);
-  EXPECT_EQ(in_struct_size, buf->num_bytes_used);
-
-  encode_fn(in_struct, in_struct_size, NULL);
-  encode_fn(out_struct, buf->num_bytes_used, NULL);
-  EXPECT_EQ(0, memcmp(in_struct, out_struct, buf->num_bytes_used));
-
-  decode_fn(in_struct, in_struct_size, NULL, 0);
-}
-
-#endif  // MOJO_PUBLIC_C_BINDINGS_TESTS_TESTING_UTIL_H_