Fix fuzzer-found inconsistency in AEC3 config json parsing
Fix fuzzer-found inconsistency in AEC3 config json parsing

Type mismatches will silently fail and skip reading a parameter
in the JSON parsing, except when parsing a size_t from a negative int.

This CL updates the parsing to silently ignore negative values provided
for size_t config parameters, instead of explicitly DCHECKing.

Tested: Ran the fuzzer on the crash test case with + without this fix.

Bug: chromium:1016139
Change-Id: I3899e81e1183aa54b708030efeb6e0006b8cd881
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/157894
Commit-Queue: Sam Zackrisson <b1a93beadfe1d2f7f0106ee02b6ffcdc950aa103@webrtc.org>
Reviewed-by: Per Åhgren <3616c2c8a2c30a769c5419f89b4a810ea6e2f079@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#29568}

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