Revert of Add GN build rules to allow java_assertion_enabler to enable Java asserts. (patchset #2 id:140001 of https://codereview.chromium.org/2506013004/ )

Reason for revert:
This CL cause WebView to crash

BUG=666193

Original issue's description:
> Reland of Add GN build rules to allow java_assertion_enabler to enable Java asserts.
>
> Reverted in:
> https://codereview.chromium.org/2507153002/
>
> Reason for reland:
> Now explicitly lists default toolchain
>
> Also modify java_assertion_enabler to resolve cycle dependency issue
> and empty jar issue.
>
> TBR=jbudorick@chromium.org,agrieve@chromium.org,toyoshim@chromium.org,qinmin@chromium.org
> BUG=462676,665157,665478
>
> Committed: https://crrev.com/95785a8601992a057837bc189e9f7eba61701f1e
> Cr-Commit-Position: refs/heads/master@{#432607}

TBR=jbudorick@chromium.org,agrieve@chromium.org,toyoshim@chromium.org,qinmin@chromium.org,zpeng@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=462676,665157,665478

Review-Url: https://codereview.chromium.org/2506263003
Cr-Commit-Position: refs/heads/master@{#432789}
7 files changed