Google announced that it will stop its Google Earth API a year from now.
Google say on its Geo Developers blog
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.