[whatwg] Please always use utf-8 for Web Workers

[Simon Pieters]

Workers are new and seems very likely to be incompatible with existing  
scripts. So it is not subject to legacy content with legacy encodings.  
Therefore, we should be able to always use utf-8 for workers. Always using  
utf-8 is simpler to implement and test and encourages people to switch to  
utf-8 elsewhere.

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Simon Pieters
Opera Software