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This reverts commit 29a153c3.

Reason for revert: Causing build failures https://bugs.chromium.org/p/chromium/issues/detail?id=807391

Original change's description:
> [2] Build unrar only for full safe browsing mode.
> 
> - Enables exception handling: throw/try/catch.
> - Disables a bunch of warnings that this library is full of.
>   - "-Wno-dangling-else"
>   - "-Wno-logical-op-parentheses"
>   - "-Wno-switch"
> 
> Bug: 750327
> Change-Id: Ic08f67e328da2f22f3503eab074be6aaf2f2fc90
> Reviewed-on: https://chromium-review.googlesource.com/872219
> Reviewed-by: Ken Rockot <rockot@chromium.org>
> Reviewed-by: Nathan Parker <nparker@chromium.org>
> Reviewed-by: Jialiu Lin <jialiul@chromium.org>
> Commit-Queue: Varun Khaneja <vakh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#531926}

TBR=rockot@chromium.org,nparker@chromium.org,vakh@chromium.org,jialiul@chromium.org

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

Bug: 750327
Change-Id: Ided3cdfc2b4849de090a329a29de94288b616a3c
Reviewed-on: https://chromium-review.googlesource.com/894999Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533337}