[LanguageModel] Clear the model when clearing full history

components/translate/core/browser/language_model.h

Index: components/translate/core/browser/language_model.h
diff --git a/components/translate/core/browser/language_model.h b/components/translate/core/browser/language_model.h
index 1dc7436ce1f01f730b82c8255d8b40be2891a49c..b6547f0f7c4f2b47d170faf9bfea5344405b80f7 100644
--- a/components/translate/core/browser/language_model.h
+++ b/components/translate/core/browser/language_model.h
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/macros.h"
+#include "base/time/time.h"
 #include "components/keyed_service/core/keyed_service.h"
 
 class PrefRegistrySimple;
@@ -56,6 +57,9 @@ class LanguageModel : public KeyedService {
   // Informs the model that a page with the given language has been visited.
   void OnPageVisited(const std::string& language_code);
 
+  // Reflect in the model that history from |begin| to |end| gets cleared.
+  void ClearHistory(base::Time begin, base::Time end);
+
  private:
   PrefService* pref_service_;