Make readystatechange fire more often (fixes#13481)
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The spec removed it. Check the scheme instead, data is always same origin now,
except for workers.
This also updates the comments to make step numbers match the spec.
Closes#13362
Consistently use the name 'pipeline_id' to refer to a function that
returns an (optional) PipelineId.
This was prompted by discovering both fn pipeline and fn pipeline_id
doing the same job in htmliframeelement.rs.
Note that there is fn pipeline in components/compositing/compositor.rs,
but that actually returns an Option<&CompositionPipeline>, not any kind
of PipelineId.
Add the append method for the Headers API
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This commit adds the append method for the Headers API. @malisas and I are both contributors.
There are a few TODOs related:
- The script needs to parse the header value for certain header names to decide the header group it belongs
- There are possible spec bugs that could change what a valid header value looks like (related: [issue page](https://github.com/whatwg/fetch/issues/332))
There are WPT tests already written for the Headers API, but they will fail as the Headers API is not fully implemented.
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Remove DataSlice, fix#12249
r? @Manishearth
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