Separated CSSValueID calls to to CSSPrimitiveValue::create

Until now, calls to CSSPrimitiveValue::create<CSSValueID> compiled
correctly since a constructor exists that takes a CSSValueID. However,
create() should be reserved for custom constructors defined for platform
enums, etc. Also, as pre-work to splitting out CSSValueID, calls to
these two functions need to be distinct.

This change adds an assert to create() so that calling it with a
CSSValueID throws a compile error, and fixes all callsites that break
with this change.

Also removes the custom constructors for int, short, float etc, since
these shouldn't exist. Callers should explicitly specify the number type
to prevent confusion (there are only 3 callsites that violate this and
they are all in one place).

BUG=523893

Review URL: https://codereview.chromium.org/1409933010

Cr-Commit-Position: refs/heads/master@{#358162}

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