refactor(input): remove $$parserName from email, url

Since email and url don't use $parsers, we do not need to set the parserName.
This also reduces the number of times the valid / invalid classes are
set within  for the input or possible parent forms.

This was discovered when fixing angular#14249. The additional class settings triggered
a cancellation of the structural animation. A general fix for this behavior has
landed as <insert commit here>

Author: Narretz

src/ng/directive/input.js

@@ -1440,20 +1440,18 @@ function urlInputType(scope, element, attr, ctrl, $sniffer, $browser) {
   baseInputType(scope, element, attr, ctrl, $sniffer, $browser);
   stringBasedInputType(ctrl);
 
-  ctrl.$$parserName = 'url';
   ctrl.$validators.url = function(modelValue, viewValue) {
     var value = modelValue || viewValue;
     return ctrl.$isEmpty(value) || URL_REGEXP.test(value);
   };
 }
 
 function emailInputType(scope, element, attr, ctrl, $sniffer, $browser) {
-  // Note: no badInputChecker here by purpose as `url` is only a validation
+  // Note: no badInputChecker here by purpose as `email` is only a validation
   // in browsers, i.e. we can always read out input.value even if it is not valid!
   baseInputType(scope, element, attr, ctrl, $sniffer, $browser);
   stringBasedInputType(ctrl);
 
-  ctrl.$$parserName = 'email';
   ctrl.$validators.email = function(modelValue, viewValue) {
     var value = modelValue || viewValue;
     return ctrl.$isEmpty(value) || EMAIL_REGEXP.test(value);