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Checking (result.error_code != JSON_NO_ERROR) is equivalent to checking
result.value (which has a base::Optional type, convertible to bool).
Callers don't care about error_code, other than == or != JSON_NO_ERROR.

Bug: 1069271
Bug: 1070409
Change-Id: I5483d116ee9d5813815118c495474ba50f4255e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2154435Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760243}