[translate] Add translate ranker model loader.

chrome/browser/translate/translate_ranker_metrics_provider.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 COMPONENTS_TRANSLATE_CORE_BROWSER_BROWSER_TRANSLATE_RANKER_METRICS_PROVIDER_H_
-#define COMPONENTS_TRANSLATE_CORE_BROWSER_BROWSER_TRANSLATE_RANKER_METRICS_PROVIDER_H_
+#ifndef CHROME_BROWSER_TRANSLATE_TRANSLATE_RANKER_METRICS_PROVIDER_H_
+#define CHROME_BROWSER_TRANSLATE_TRANSLATE_RANKER_METRICS_PROVIDER_H_
 
 #include "components/metrics/metrics_provider.h"
 
 namespace translate {
 
 // Provides metrics related to the translate ranker.
 class TranslateRankerMetricsProvider : public metrics::MetricsProvider {
  public:
-  TranslateRankerMetricsProvider();
-  ~TranslateRankerMetricsProvider() override;
+  TranslateRankerMetricsProvider() {}
+  ~TranslateRankerMetricsProvider() override {}
 
  private:
   // From metrics::MetricsProvider...
   void ProvideGeneralMetrics(
       metrics::ChromeUserMetricsExtension* uma_proto) override;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateRankerMetricsProvider);
 };
 
 }  // namespace translate
 
-#endif  // COMPONENTS_TRANSLATE_CORE_BROWSER_BROWSER_TRANSLATE_RANKER_METRICS_PROVIDER_H_
+#endif  // CHROME_BROWSER_TRANSLATE_TRANSLATE_RANKER_METRICS_PROVIDER_H_