webkit_tests failing on 2 builders

Builders failed on: 
- WebKit Linux Trusty Leak: 
  https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20Trusty%20Leak
- WebKit Win7: 
  https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7

07:37:24.800 1916 [7338/50039] compositing/reflections/nested-reflection-transition.html failed unexpectedly (image diff)
07:37:24.799 4340 worker/6 compositing/reflections/nested-reflection-transition.html failed:
07:37:24.800 4340 worker/6  image diff