You can't make your own browser anymore. The complexity of HTTP, HTML, CSS, JavaScript, and soon QUIC (in place of TCP) has grown to the point where only a handful of large, well-capitalized institutions (and really only Google, if you consider WebKit's ubiquity) can develop and maintain a secure, efficient, modern web browser. Most alternative browsers, even forks of Firefox/Mozilla, have either been abandoned, or fallen so far behind that they have no future.
This is almost certainly deliberate on Google's part. They want to control the browser, because outside of apps, it's through the browser that they deliver ads, and over 80% of their revenue comes from ads, and the more they control the browser, the harder they can make it to block ads. They don't even have to prevent it fully; just make it so difficult that only a small minority of technically-inclined, and sufficiently motivated users will do it.