IDBCursor.key should return int if key is integer.

[DartBot]

This issue was originally filed by podivilov@google.com

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IDBCursor.key should return int if key is integer.

[DartBot]

This comment was originally written by antonm@google.com

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Added this to the M1 milestone.

[DartBot]

This comment was originally written by podivilov@google.com

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Added Fixed label.