Revert "[code coverage] Add all fuzzer targets"

This reverts commit 229cb506298f51c62a9cc6c85ac9d6884dcb48b4.

Reason for revert: Builder Deterministic Linux (dbg) failed several fuzz tests:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Deterministic%20Linux%20%28dbg%29/3801

From Log:
Unexpected files with diffs:
  libboringssl_fuzzer.so
  libboringssl_fuzzer_no_fuzzer_mode.so
  merkle_integrity_source_stream_fuzzer
  renderer_fuzzer
  renderer_proto_tree_fuzzer
  renderer_tree_fuzzer

Original change's description:
> [code coverage] Add all fuzzer targets
> 
> R=​jbudorick,stgao,liaoyuke
> 
> Change-Id: I78ffec6525cd1d808a4b431ae1e2729b76357d46
> Reviewed-on: https://chromium-review.googlesource.com/c/1372917
> Commit-Queue: Shuotao Gao <stgao@chromium.org>
> Reviewed-by: Shuotao Gao <stgao@chromium.org>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#615834}

TBR=stgao@chromium.org,robertocn@chromium.org,liaoyuke@chromium.org,jbudorick@chromium.org

Change-Id: Id148793c58c415ceec56a532257f1beebfdee041
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/1373835
Reviewed-by: Friedrich Horschig [CET] <fhorschig@chromium.org>
Commit-Queue: Friedrich Horschig [CET] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615867}
7 files changed