Fix a minification issue with the __hasRegisterFinished property.

[bicknellr]

Wrap hasOwnProperty checks for __hasRegisterFinished in JSCompiler_renameProperty().

[kevinpschaaf]

While we're at it, I just searched the code and there are a few other hasOwnProperty checks with string literals that should be wrapped in JSCompiler_renameProperty:

• properties-changed.js: __dataHasAccessor
• properties-changed.js: __dataAttributes
• properties-mixin.js: __observedAttributes

I spot checked these in compiled code and I don't see them being renamed (not entirely sure why), but for safety, let's go ahead and close the hole.

[bicknellr]

I've never actually used JSCompiler_renameProperty and I wasn't able to find any documentation about the two-argument form, but from other uses I gathered that the second argument was meant to be the thing that you're going to pull the property from (i.e. thing[JSCompiler_renameProperty('propName', thing)]). Is that correct?

[kevinpschaaf]

Yeah that's right, 2nd arg is the context object for the property being dereferenced.

LGTM