According to PCMag.com Google is rather peeved at Symantec for issuing fraudulent security certificates for numerous domains, including Google. This started out with just a few bad certs and then Google started looking into it themselves. Google found more bad certs than what Symantec first quoted, a few weeks later Symantec found more on their own after their own audit.
From the article:
So Google issued an ultimatum: Starting next summer, all Symantec-issued certificates must support the Chromium Certificate Transparency policy, or else. In the short term, the Web titan requested an updated incident report, in which Symantec explains why it did not detect the additional certificates found so easily by Google. And, in true detention-hall style, Google also asked Symantec what it thinks caused each slip-up, and what the company will do to fix them.
Symantec did not immediately respond to a request for comment.