Remove Cronet

No concrete plan to ship Cronet for now

Test: TH
Bug: 188872256
Merged-In: I3d70dc37da18373b4ba54809c6a6734fee61761e
Change-Id: If7a81ba23e0591cc0dd7a9346cb78e77f53feb66
34 files changed
tree: 4b825dc642cb6eb9a060e54bf8d69288fbee4904

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