Remove the `src` attribute from `Image` objects used with natively supported JPEG images, when pages are cleaned-up/destroyed
Remove the `src` attribute from `Image` objects used with natively supported JPEG images, when pages are cleaned-up/destroyed

This will further help reduce the amount of image data that's currently being held alive, by explicitly removing the `src` attribute.

Please note that this is mostly relevant for browsers which do not support `URL.createObjectURL`, or where `disableCreateObjectURL` was manually set by the user, since `blob:` URLs will be revoked (see the previous patch).
However, using `about:memory` (in Firefox) it does seem that this may also be generally helpful, given that calling `URL.revokeObjectURL` won't invalidate the image data itself (as far as I can tell).

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