title: Where is a "Sync project with gradle files" button in Android Studio 3?
body: <p>This button disappeared from a new 3.1 version of AS Toolbar. Before it showed as:
  <a href="https://i.stack.imgur.com/d15o5.png" rel="noreferrer"><img src="https://i.stack.imgur.com/d15o5.png" alt="enter image description here"></a></p>
  
  <p>Now it's missing:</p>
  
  <p><a href="https://i.stack.imgur.com/j1Rnv.png" rel="noreferrer"><img src="https://i.stack.imgur.com/j1Rnv.png" alt="enter image description here"></a></p>