Remove divergence in ExperimentalCronetEngine

* Alot of the code living in ExperimentalCronetEngine has been moved to live in ExperimentalOptionsTranslatingCronetEngineBuilder
upstream but this was not reflected downstream.

Test: atest NetHttpTests && atest CtsNetHttpTestCases
Bug: 304217500
Change-Id: I12a6690cbad74cfd717986bcce69fc4af9f5e2a7
2 files changed