Expose method to reset translate settings.

ios/web_view/public/cwv_translation_controller.h

 // Copyright 2017 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 IOS_WEB_VIEW_PUBLIC_CWV_TRANSLATION_CONTROLLER_H
 #define IOS_WEB_VIEW_PUBLIC_CWV_TRANSLATION_CONTROLLER_H
 
 #import <Foundation/Foundation.h>
 
 #import "cwv_export.h"
@@ skipping 34 matching lines @@
 @interface CWVTranslationController : NSObject
 
 // Delegate to receive translation callbacks.
 @property(nullable, nonatomic, weak) id<CWVTranslationControllerDelegate>
     delegate;
 
 // The set of supported languages for translation.
 @property(nonatomic, readonly)
     NSSet<CWVTranslationLanguage*>* supportedLanguages;
 
+// Resets all translation policies to default (CWVTranslationPolicyAsk).
+// Only resets non-incognito settings.
++ (void)resetTranslationPolicies;
+
 // Begins translation on the current page from |sourceLanguage| to
 // |targetLanguage|. These language parameters must be chosen from
 // |supportedLanguages|. Set |userInitiated| to YES if translation
 // is a result of explicit user action. |userInitiated| will be
 // passed along to the CWVTranslationControllerDelegate methods.
 // Results in a No-op if there is no current page.
 - (void)translatePageFromLanguage:(CWVTranslationLanguage*)sourceLanguage
                        toLanguage:(CWVTranslationLanguage*)targetLanguage
                     userInitiated:(BOOL)userInitiated;
 
 // Reverts any translations done back to the original page language.
 // Note that the original page language may be different from |sourceLanguage|
 // passed to |translatePageFromLanguage:toLanguage:userInitiated:| above.
 // Results in No-op if the page was never translated.
 - (void)revertTranslation;
 
 // Sets or retrieves translation policies associated with a specified language.
 // |pageLanguage| should be the language code of the language.
+// Not supported in incognito mode.
 - (void)setTranslationPolicy:(CWVTranslationPolicy*)policy
              forPageLanguage:(CWVTranslationLanguage*)pageLanguage;
 - (CWVTranslationPolicy*)translationPolicyForPageLanguage:
     (CWVTranslationLanguage*)pageLanguage;
 
 // Sets or retrieves translation policies associated with a specified page.
 // |pageHost| should be the hostname of the website. Must not be empty.
+// Not supported in incognito mode.
 - (void)setTranslationPolicy:(CWVTranslationPolicy*)policy
                  forPageHost:(NSString*)pageHost;
 - (CWVTranslationPolicy*)translationPolicyForPageHost:(NSString*)pageHost;
 
 @end
 
 NS_ASSUME_NONNULL_END
 
 #endif  // IOS_WEB_VIEW_PUBLIC_CWV_TRANSLATION_CONTROLLER_H