add a closure around Font so we can hide helper functions in it

fonts.js

@@ -84,7 +84,8 @@ var Fonts = {
  *   var type1Font = new Font("MyFontName", binaryFile, propertiesObject);
  *   type1Font.bind();
  */
-var Font = function(aName, aFile, aProperties) {
+var Font = (function () {
+  var constructor = function(aName, aFile, aProperties) {
     this.name = aName;
 
     // If the font has already been decoded simply return it
@@ -135,10 +136,10 @@ var Font = function(aName, aFile, aProperties) {
 
     // Attach the font to the document
     this.bind();
-};
+  };
 
 
-/**
+  /**
    * A bunch of the OpenType code is duplicate between this class and the
    * TrueType code, this is intentional and will merge in a future version
    * where all the code relative to OpenType will probably have its own
@@ -146,7 +147,7 @@ var Font = function(aName, aFile, aProperties) {
    * But at the moment it allows to develop around the TrueType rewriting
    * on the fly without messing up with the 'regular' Type1 to OTF conversion.
    */
-Font.prototype = {
+  constructor.prototype = {
     name: null,
     font: null,
     mimetype: null,
@@ -564,8 +565,10 @@ Font.prototype = {
         fontData.push(otf[i]);
       return fontData;
     }
-};
+  };
 
+  return constructor;
+})();
 
 /**
  * FontsUtils is a static class dedicated to hold codes that are not related