Today chrome updated for most user to "Chrome 52". The obvious change is the new material design update that changes the look and feel of the whole browser. If your not a fan of the new design here is how to disable it.
- In the URL bar, type in chrome://flags and press Enter.
- Find “Material Design in the browser’s top chrome” and change it to “Non Material” to revert back to the old interface, or “Material Hybrid”, a hybrid mode