Remove duplicate function definitions

[LinusU]

The removed methods are present on the Blob that we are extends-ing:

https://github.com/microsoft/TypeScript/blob/dbaeed5ad87cf846dddf0d278df3699e9f91cd21/lib/lib.dom.d.ts#L2537-L2544

[codecov]

Codecov Report

Merging #37 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #37   +/-   ##
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  Coverage   86.95%   86.95%           
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  Files           1        1           
  Lines          69       69           
  Branches       13       13           
=======================================
  Hits           60       60           
  Misses          9        9           

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[LinusU]

Actually, I think that the reason that these were included in the first place was because they weren't present in upstream TypeScript at the time. This have been fixed now with: microsoft/TypeScript#36164

Since this is now fixed, what do we think about just doing:

/// <reference lib="dom"/>
export = Blob;

The drawback would be that we would remove [Symbol.toStringTag] and toString. But if we think that it's correct to have them on the Blob I think it would be better to submit patches upstream to add that instead, since the idea behind this package is to bring Blob cross platform.

[LinusU]

Closing in favour of #38