Quick Answers: Clean up language detector

Bug: b/168541952
Test: Run existing tests
Change-Id: I3aa883b677516b646658c583165eff017e728117
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518722
Auto-Submit: Yue Li <updowndota@chromium.org>
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824029}

chromeos/components/quick_answers/BUILD.gn

@@ -32,8 +32,6 @@ source_set("quick_answers") {
     "translation_result_loader.h",
     "understanding/intent_generator.cc",
     "understanding/intent_generator.h",
-    "utils/language_detector.cc",
-    "utils/language_detector.h",
     "utils/quick_answers_metrics.cc",
     "utils/quick_answers_metrics.h",
     "utils/quick_answers_utils.cc",

chromeos/components/quick_answers/utils/language_detector.cc

-// Copyright 2020 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 "chromeos/components/quick_answers/utils/language_detector.h"
-
-#include "third_party/cld_3/src/src/nnet_language_identifier.h"
-
-namespace chromeos {
-namespace quick_answers {
-namespace {
-
-using chrome_lang_id::NNetLanguageIdentifier;
-
-const int kMinNumBytes = 0;
-const int kMaxNumBytes = 1000;
-
-}  // namespace
-
-LanguageDetector::LanguageDetector() {
-  lang_id_ =
-      std::make_unique<NNetLanguageIdentifier>(kMinNumBytes, kMaxNumBytes);
-}
-
-LanguageDetector::~LanguageDetector() = default;
-
-std::string LanguageDetector::DetectLanguage(const std::string& text) {
-  const NNetLanguageIdentifier::Result result = lang_id_->FindLanguage(text);
-
-  std::string language;
-  if (result.is_reliable)
-    language = result.language;
-
-  return language;
-}
-
-}  // namespace quick_answers
-}  // namespace chromeos

chromeos/components/quick_answers/utils/language_detector.h

-// Copyright 2020 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 CHROMEOS_COMPONENTS_QUICK_ANSWERS_UTILS_LANGUAGE_DETECTOR_H_
-#define CHROMEOS_COMPONENTS_QUICK_ANSWERS_UTILS_LANGUAGE_DETECTOR_H_
-
-#include <memory>
-#include <string>
-
-namespace chrome_lang_id {
-class NNetLanguageIdentifier;
-}  // namespace chrome_lang_id
-
-namespace chromeos {
-namespace quick_answers {
-
-// Utility class for language detection.
-// TODO(b/168541952): Cleanup this class after the new language detection API
-// becomes stable.
-class LanguageDetector {
- public:
-  LanguageDetector();
-  LanguageDetector(const LanguageDetector&) = delete;
-  LanguageDetector& operator=(const LanguageDetector&) = delete;
-  virtual ~LanguageDetector();
-
-  // Returns the ISO 639 language code of the specified |text|, or empty string
-  // if it failed. Virtual for testing.
-  virtual std::string DetectLanguage(const std::string& text);
-
- private:
-  std::unique_ptr<chrome_lang_id::NNetLanguageIdentifier> lang_id_;
-};
-
-}  // namespace quick_answers
-}  // namespace chromeos
-
-#endif  // CHROMEOS_COMPONENTS_QUICK_ANSWERS_UTILS_LANGUAGE_DETECTOR_H_