Move the C bindings tests to the new location.

mojo/public/c/tests/bindings/union_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.
 
 // TODO(vardhan): Needs a lot more testing.
 
 #include <mojo/bindings/union.h>
 
 #include <mojo/bindings/array.h>
 
-#include "mojo/public/c/bindings/tests/testing_util.h"
+#include "mojo/public/c/tests/bindings/testing_util.h"
 #include "mojo/public/interfaces/bindings/tests/test_structs.mojom-c.h"
 #include "mojo/public/interfaces/bindings/tests/test_unions.mojom-c.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 struct mojo_test_StructOfUnionOfReferences* MakeStructOfUnionReference(
     struct MojomBuffer* buf) {
   auto* struct_with_union =
       static_cast<struct mojo_test_StructOfUnionOfReferences*>(
@@ skipping 172 matching lines @@
     struct MojomBuffer buf2 = {buffer_bytes2, sizeof(buffer_bytes2), 0};
     CopyAndCompare(
         &buf2, struct_with_union, buf.num_bytes_used,
         mojo_test_StructOfUnionOfReferences_DeepCopy,
         mojo_test_StructOfUnionOfReferences_EncodePointersAndHandles,
         mojo_test_StructOfUnionOfReferences_DecodePointersAndHandles);
   }
 }
 
 }  // namespace