Migrate content setting PROMPT_NO_DECISION_COUNT to PERMISSION_AUTOBLOCKER_DATA

components/content_settings/core/browser/content_settings_pref_provider.cc

Index: components/content_settings/core/browser/content_settings_pref_provider.cc
diff --git a/components/content_settings/core/browser/content_settings_pref_provider.cc b/components/content_settings/core/browser/content_settings_pref_provider.cc
index 33c52f9d0e1886e171ebf40d668de1b6a6c72442..e544e4f004ab7b794e3833153de6863a4d872d80 100644
--- a/components/content_settings/core/browser/content_settings_pref_provider.cc
+++ b/components/content_settings/core/browser/content_settings_pref_provider.cc
@@ -227,6 +227,29 @@ void PrefProvider::DiscardObsoletePreferences() {
   prefs_->ClearPref(kObsoleteMouseLockExceptionsPref);
 #endif  // !defined(OS_ANDROID)
 #endif  // !defined(OS_IOS)
+
+#if !defined(OS_IOS)
+  // Migrate CONTENT_SETTINGS_TYPE_PROMPT_NO_DECISION_COUNT to
+  // CONTENT_SETTINGS_TYPE_PERMISSION_AUTOBLOCKER_DATA.
+  // TODO(raymes): See crbug.com/681709. Remove after M60.
+  const std::string prompt_no_decision_count_pref =
+      WebsiteSettingsRegistry::GetInstance()
+          ->Get(CONTENT_SETTINGS_TYPE_PROMPT_NO_DECISION_COUNT)
+          ->pref_name();
+  const base::DictionaryValue* old_dict =
+      prefs_->GetDictionary(prompt_no_decision_count_pref);
+
+  const std::string permission_autoblocker_data_pref =
+      WebsiteSettingsRegistry::GetInstance()
+          ->Get(CONTENT_SETTINGS_TYPE_PERMISSION_AUTOBLOCKER_DATA)
+          ->pref_name();
+  const base::DictionaryValue* new_dict =
+      prefs_->GetDictionary(permission_autoblocker_data_pref);
+
+  if (!old_dict->empty() && new_dict->empty())
+    prefs_->Set(permission_autoblocker_data_pref, *old_dict);
+  prefs_->ClearPref(prompt_no_decision_count_pref);
+#endif  // !defined(OS_IOS)
 }
 
 }  // namespace content_settings