Expose way to enable/disable translate.

ios/web_view/public/cwv_translation_controller.h

Index: ios/web_view/public/cwv_translation_controller.h
diff --git a/ios/web_view/public/cwv_translation_controller.h b/ios/web_view/public/cwv_translation_controller.h
index 6e9476dece1f0a3c1cc285d61e2be1f9fc41a53c..ee3106649081725778d7c3999c2ca9b73fe042d1 100644
--- a/ios/web_view/public/cwv_translation_controller.h
+++ b/ios/web_view/public/cwv_translation_controller.h
@@ -52,10 +52,6 @@ CWV_EXPORT
 @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
@@ -74,7 +70,6 @@ CWV_EXPORT
 
 // 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:
@@ -82,7 +77,6 @@ CWV_EXPORT
 
 // 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;