Remove unused import in JS (#1373)

javascript/i18n/phonenumbers/phonenumberutil.js

@@ -42,7 +42,6 @@ goog.require('goog.string');
 goog.require('goog.string.StringBuffer');
 goog.require('i18n.phonenumbers.NumberFormat');
 goog.require('i18n.phonenumbers.PhoneMetadata');
-goog.require('i18n.phonenumbers.PhoneMetadataCollection');
 goog.require('i18n.phonenumbers.PhoneNumber');
 goog.require('i18n.phonenumbers.PhoneNumber.CountryCodeSource');
 goog.require('i18n.phonenumbers.PhoneNumberDesc');