hgweb: rename an instance of XMLHttpRequest to xhr in mercurial.js "xhr" is a really widespread name for this kind of things, no idea where did "xfr" come from (the original 2228bd109706 doesn't explain that). Let's just change one letter so the name makes more sense.

hgweb: properly iterate over arrays and objects in mercurial.js In JavaScript, using for-in loops to access every property of an object can have unexpected results when inheritance is involved. For example, if some piece of code adds a property (it may be a method too) to Object.prototype, then all for-in loops that iterate over keys of any object (also anything that inherits Object) will get that property on one of the iterations. To filter out such unexpected properties for-in loops have to use Object.hasOwnProperty() method. (This corresponds to "forin" option of jshint). In the two first cases "data" and "edges" are arrays, to it's simpler to just switch to using a regular for-with-a-counter loop.