[libfuzzer] Use max_len=803500 for convert_woff2ttf_fuzzer.
[libfuzzer] Use max_len=803500 for convert_woff2ttf_fuzzer.

TBR=aizatsky@chromium.org, ochang@chromium.org
BUG=608803

Review-Url: https://codereview.chromium.org/1945833002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#391325}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk