Google has off-loaded static content (Javascript/Images/CSS) to a different domain name in an effort to reduce bandwidth usage and increase network performance for the end user.
https://google.com
Content Delivery Network
Get access to data on 61,218,691 websites that are GStatic Google Static Content Customers. We know of 15,973,414 live websites using GStatic Google Static Content and an additional 45,245,277 sites that used GStatic Google Static Content historically and 2,318,830 websites in the United States.
Get a list of 61,218,691 websites using GStatic Google Static Content which includes location information, hosting data, contact details, 15,973,414 currently live websites and an additional 3,265,550 domains that redirect to sites in this list. 45,245,277 sites that used this technology previouslyand 2,318,830 websites in the United States currently using GStatic Google Static Content.
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