UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36
Platform: 10176.76.0

Steps to reproduce the problem:
According to official Android documentation about optimization Android apps for ChromeOS you should add meta-data WindowManagerPreference:SuppressWindowControlNavigationButton in ApplicationManifest to hide ChromeOS window back button
https://developer.android.com/topic/arc/optimizing.html#navigation-patterns

Steps to reproduce:
1. Create Android application
2. Add this code inside <application/> tag:
<meta-data
      android:name="WindowManagerPreference:SuppressWindowControlNavigationButton"
      android:value="true" />
3. Build application
4. Install to ChromeOS device

What is the expected behavior?
ChromeOS window toolbar back button shouldn't be visible, only native application navigation

What went wrong?
ChromeOS window toolbar contains back button that duplicates application navigation

Did this work before? No 

Chrome version: 65.0.3325.181  Channel: stable
OS Version: 64.0.3282.190
Flash Version: 29.0.0.113