Google updates Gmail for Android with anti-phishing security checks
The site you are trying to visit has been identified as forgery, intended to trick you into disclosing financial, personal, or other sensitive information.
Obviously, these security features are never bulletproof, so you may still receive these warnings when you try to visit an entirely legit website, but hey, it's better to be safe than sorry.
Even Google mentions that while not all affected email might be dangerous, it's recommended to be very careful about clicking on links in messages that you are not 100% sure about. Basically, the update provides Gmail users with a security tool that will allow them to avoid phishing and scam attempts.
source: Google
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Things that are NOT allowed: