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This change cleans up the CodeCacheHost fuzzer, moving the per-testcase
code into the CodeCacheHostTestcase object and removing
CodeCacheHostFuzzerContext since this was redundant.

Bug: 1076336
Change-Id: I8736106edadb4a88c9d46a007ed5404fec6d4d4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2329571
Commit-Queue: Mark Brand <markbrand@google.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799623}