Remove Cronet

No concrete plan to ship Cronet for now

Merged-In ID is from an unrelated change in this project that happens to be merged into branches downstream of tm-dev.

Test: TH
Bug: 230548501
Merged-In: I2e912bdb10e095e9311cb1b6c3234f99e297daa7
Change-Id: I485aee73d18f8be018736bf620e8c200bda86a18
34 files changed
tree: 4b825dc642cb6eb9a060e54bf8d69288fbee4904

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