Fix build of own emoji functions

third_party/WebKit/Source/platform/text/ICUErrorTest.cpp

+// 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 "platform/text/ICUError.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+const UErrorCode kTestErrorCode = U_INVALID_FORMAT_ERROR;
+
+void causeICUError(UErrorCode& err) {
+  err = kTestErrorCode;
+}
+
+TEST(ICUErrorTest, assignToAutomaticReference) {
+  ICUError icuError;
+  EXPECT_EQ(icuError, U_ZERO_ERROR);
+  causeICUError(icuError);
+  EXPECT_EQ(icuError, kTestErrorCode);
+}
+
+}  // namespace blink