chore(Angular): remove superfluous fromCharCode function

Remove fromCharCode function as it was used only in two inner
functions in the code, and its functionality is achieved in several
other places by using String.fromCharCode

Breaks fromCharCode closure function, String.fromCharCode should be
used instead

Author: Javier Mendiara Cañardo

src/Angular.js

@@ -28,12 +28,12 @@ var uppercase = function(string){return isString(string) ? string.toUpperCase()
 
 var manualLowercase = function(s) {
   return isString(s)
-      ? s.replace(/[A-Z]/g, function(ch) {return fromCharCode(ch.charCodeAt(0) | 32);})
+      ? s.replace(/[A-Z]/g, function(ch) {return String.fromCharCode(ch.charCodeAt(0) | 32);})
       : s;
 };
 var manualUppercase = function(s) {
   return isString(s)
-      ? s.replace(/[a-z]/g, function(ch) {return fromCharCode(ch.charCodeAt(0) & ~32);})
+      ? s.replace(/[a-z]/g, function(ch) {return String.fromCharCode(ch.charCodeAt(0) & ~32);})
       : s;
 };
 
@@ -46,8 +46,6 @@ if ('i' !== 'I'.toLowerCase()) {
   uppercase = manualUppercase;
 }
 
-function fromCharCode(code) {return String.fromCharCode(code);}
-
 
 var /** holds major version number for IE or NaN for real browsers */
     msie              = int((/msie (\d+)/.exec(lowercase(navigator.userAgent)) || [])[1]),