Revert "update_engine: trigger a crash on unrecoverable condition"

This reverts commit 1329fd880962c9441d4ca462e8cda3fbc29049c9.

Reason for revert: https://crbug.com/962730#c18

Original change's description:
> update_engine: trigger a crash on unrecoverable condition
> 
> CURLM_INTERNAL_ERROR and CURLM_OUT_OF_MEMORY are two libcurl error codes
> that caller (update_engine) has no way to recover on its own. Reference: https://curl.haxx.se/libcurl/c/libcurl-errors.html
> 
> Since those error conditions aren't recoverable and might be responsible
> for the failures to update observed in crbug.com/927039, we exit and let the
> system respawn update_engine to start from a fresh state and recover.
> 
> BUG=chromium:962730,chromium:927039
> TEST=unittest
> 
> Change-Id: I55946e58e518da5bc5cb0c23690430c6298b8582
> Reviewed-on: https://chromium-review.googlesource.com/1616425
> Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
> Tested-by: Xiaochu Liu <xiaochu@chromium.org>
> Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
> Reviewed-by: Amin Hassani <ahassani@chromium.org>

TBR=senj@chromium.org,norvez@chromium.org,ahassani@chromium.org,xiaochu@chromium.org,chromiumos-cl-exonerator@appspot.gserviceaccount.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:962730, chromium:927039
Change-Id: I3d10173cdacfcd1edf22b4515dce6091e9d3b258
Reviewed-on: https://chromium-review.googlesource.com/c/aosp/platform/system/update_engine/+/1737130
Reviewed-by: Xiaochu Liu <xiaochu@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
Tested-by: Xiaochu Liu <xiaochu@chromium.org>
Commit-Queue: Xiaochu Liu <xiaochu@chromium.org>

0 files changed, 0 insertions, 0 deletions