compile failing on chromium.android/Android Cronet Data Reduction Proxy Builder

Type: build-failure

Builders failed on: 
- Android Cronet Data Reduction Proxy Builder: 
  https://build.chromium.org/p/chromium.android/builders/Android%20Cronet%20Data%20Reduction%20Proxy%20Builder


This was caused by https://codereview.chromium.org/2626963003. rajendrant@ could you fix this ASAP? Thanks!