No, Google Did Not Unilaterally Decide to Kill XSLT

After Mason opened the issue, members of the Mozilla and WebKit teams expressed (tentative, mostly) support for the idea of exploring this removal. Basically, none of the vendors are particularly keen on keeping native XSLT support in their codebases, particularly after security flaws were found in XSLT implementations.
Google has trillions of dollars. The Chrome team very much does not. They probably get, at best, a tiny fraction of one percent of those dollars.
The discussion was opened by a Google employee in response to interest from multiple browser vendors in removing built-in XSLT, following a process that is opaque to most outsiders. It’s a first step in a multi-step evaluation process that can take years to complete, and whose outcome is not predetermined.