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Some callers (in bigger, more complicated code and tests) rely on
StringToDouble's "return non-zero with failure" best-effort behavior
when the number has a unit suffix.

Change-Id: I7ac38fec189e8193895547664ddc09c071e1bdc4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2310370
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791381}