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This reverts commit af00b29e.

Reason for revert: Suspect for https://crbug.com/873015

I have low confidence that this is the culprit but it's my best guess.

Original change's description:
> Delete constructor for creating empty CSSStyleSheets
> 
> Currently, empty CSSStyleSheets can be constructed either with a constructor or with Document.createEmptyCSSStyleSheet.
> This CL deletes the constructor so that they can only be produced by Document.createEmptyCSSStyleSheet.
> 
> Document.createEmptyCSSStyleSheet is considered to be more desirable, as CSSStyleSheets produced by Document.createEmptyCSSStyleSheet can be tied to documents in the future. This means that their use can be limited in the documents where they were produced, resulting in higher security.
> 
> Note:
> The constructed CSSStyleSheet is not currently tied to the Document yet
> 
> Link to related comments in discussion:
> https://github.com/WICG/construct-stylesheets/issues/23#issuecomment-379180786
> https://github.com/WICG/construct-stylesheets/issues/15#issuecomment-391216056
> 
> Bug: 807560
> Change-Id: I767e15e83e1f31eb278bc81233c8b579d0f511c7
> Reviewed-on: https://chromium-review.googlesource.com/1164876
> Reviewed-by: Rakina Zata Amni <rakina@chromium.org>
> Reviewed-by: Hayato Ito <hayato@chromium.org>
> Commit-Queue: Momoko Sumida <momon@google.com>
> Cr-Commit-Position: refs/heads/master@{#581836}

TBR=hayato@chromium.org,rakina@chromium.org,momon@google.com

Change-Id: Iea70ff4dcc3a5ecf3a806b417572fd8f88e2e58b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 807560, 873015
Reviewed-on: https://chromium-review.googlesource.com/1170462Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Commit-Queue: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582054}