If anything Google made Maps shittier over time (similarly to how they've managed to fuck over their own GMail offering).
As for Chrome, that was originally developed by KDE devs first and Apple second into a modern browser engine. The innovation part was theirs. Google just adopted it wholesale in the beggining, and started monopolizing its steering...
That’s... not how that works. You’re talking about WebKit, but the innovation of Chrome was separate processes for everything so a crash anywhere wouldn’t take down the whole browser. Sure, they’ve gone a bit “mad with power,” but to claim Google did nothing in the beginning is ignoring reality.
I'd argue that's more of an evolution than an innovation.
It had only just become normal for home and office PCs to feature multi-core processors. High capacity RAM was becoming relatively cheap compared to other PC components. We were still in the early days of webapps and social media. The concept of "browser tabs" was still new.
Google had the advantage of starting from ground zero, so they could consider these new trends as part of their design. Incumbents had to re-work their existing tech to take advantage of those trends.