Charts not displaying properly

[Jofre]

https://github.com/GoogleCloudPlatform/appengine-mapreduce/blob/6e103ac52855c3214de3ec3721d6ec0e7edd5f77/python/test/mapreduce/handlers_test.py#L519

https://github.com/GoogleCloudPlatform/appengine-mapreduce/blob/6e103ac52855c3214de3ec3721d6ec0e7edd5f77/python/test/mapreduce/handlers_test.py#L2411

https://github.com/GoogleCloudPlatform/appengine-mapreduce/blob/6e103ac52855c3214de3ec3721d6ec0e7edd5f77/python/test/mapreduce/model_test.py#L260

https://www.google.com/chart? is not working. You can choose between https://chart.googleapis.com/chart? or https://chart.apis.google.com/chart?.

I've seen the tests asserting the wrong address, but in a quick look can't find where this is set, as graphy uses self.url_base = 'http://chart.apis.google.com/chart'.

Also, this API was deprecated back in 2012.