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This patch fixes a missing check in CalcParser::consumeNumberRaw for the
CalcNumber category. This was causing non-<number> calcs to be accepted
as numbers (which caused problems in flex where <number> and <length>
can be used in the same shorthand, e.g. flex: calc(10px + 50%) 1 2)

BUG=559513,499780

Review URL: https://codereview.chromium.org/1464253002

Cr-Commit-Position: refs/heads/master@{#361070}