Google announced that it will stop its Google Earth API a year from now.
Google say on its Geo Developers blog
Over six years ago we introduced the Google Earth API, enabling developers to build rich 3D mapping applications in the browser, using JavaScript. And over the years, developers have built quite a number of fascinating applications.
However, the Earth API is built on a technology called the NPAPI plugin framework, and recently, for security reasons, both Chrome and Firefox have announced they’re removing support for this framework. These security reasons, combined with dwindling cross-platform support (particularly on mobile devices), had made building applications that leverage the Earth API untenable for developers.
The API will be officially turned off on December 12, 2015.