Convert "return local_var.Pass();" to "return local_var;".

mojo/public/cpp/bindings/tests/serialization_warning_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.
 
 // Serialization warnings are only recorded in debug build.
 #ifndef NDEBUG
 
 #include "mojo/public/cpp/bindings/array.h"
 #include "mojo/public/cpp/bindings/lib/array_internal.h"
 #include "mojo/public/cpp/bindings/lib/array_serialization.h"
@@ skipping 16 matching lines @@
   auto array = Array<Array<ScopedHandle>>::New(2);
   for (size_t i = 0; i < array.size(); ++i) {
     auto nested_array = Array<ScopedHandle>::New(3);
     for (size_t j = 0; j < nested_array.size(); ++j) {
       MessagePipe pipe;
       nested_array[j] = ScopedHandle::From(pipe.handle1.Pass());
     }
     array[i] = nested_array.Pass();
   }
 
-  return array.Pass();
+  return array;
 }
 
 class SerializationWarningTest : public testing::Test {
  public:
   ~SerializationWarningTest() override {}
 
  protected:
   template <typename T>
   void TestWarning(StructPtr<T> obj,
                    mojo::internal::ValidationError expected_warning) {
@@ skipping 164 matching lines @@
   TestArrayWarning(test_array.Pass(),
                    mojo::internal::ValidationError::UNEXPECTED_ARRAY_HEADER,
                    &validate_params_2);
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo
 
 #endif