Refactor HostContentSettingsMap::SetWebsiteSettingDefaultScope to take a std::unique_ptr.

chrome/browser/ssl/chrome_ssl_host_state_delegate.cc

Index: chrome/browser/ssl/chrome_ssl_host_state_delegate.cc
diff --git a/chrome/browser/ssl/chrome_ssl_host_state_delegate.cc b/chrome/browser/ssl/chrome_ssl_host_state_delegate.cc
index e45257f432bfe8df0d09cfcca259c1840b05df8b..7d2fdfe27313ed2b82b05e905545eb20ded06ad9 100644
--- a/chrome/browser/ssl/chrome_ssl_host_state_delegate.cc
+++ b/chrome/browser/ssl/chrome_ssl_host_state_delegate.cc
@@ -133,7 +133,7 @@ void MigrateOldSettings(HostContentSettingsMap* map) {
       if (value) {
         map->SetWebsiteSettingDefaultScope(
             url, GURL(), CONTENT_SETTINGS_TYPE_SSL_CERT_DECISIONS,
-            std::string(), value.release());
+            std::string(), std::move(value));
       }
     }
   }
@@ -310,7 +310,7 @@ void ChromeSSLHostStateDelegate::AllowCert(const std::string& host,
   // SetWebsiteSettingDefaultScope.
   map->SetWebsiteSettingDefaultScope(url, GURL(),
                                      CONTENT_SETTINGS_TYPE_SSL_CERT_DECISIONS,
-                                     std::string(), value.release());
+                                     std::string(), std::move(value));
 }
 
 void ChromeSSLHostStateDelegate::Clear() {
@@ -378,7 +378,7 @@ void ChromeSSLHostStateDelegate::RevokeUserAllowExceptions(
 
   map->SetWebsiteSettingDefaultScope(url, GURL(),
                                      CONTENT_SETTINGS_TYPE_SSL_CERT_DECISIONS,
-                                     std::string(), NULL);
+                                     std::string(), nullptr);
 }
 
 // TODO(jww): This will revoke all of the decisions in the browser context.