[Cronet] Remove CriteriaHelper
CriteriaHelper seems to be a carry-over from ContentShell testing
code and isn't necessary for Cronet Sample instrumentation tests.
R=xunjieli
TEST=Instrumentation test CronetSampleTest
Committed:
https://crrev.com/3c55da5faa5874d54f0ffa5e63b0dc6269a58990
Cr-Commit-Position: refs/heads/master@{#357107}