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Currently the policy uses a image element's naturalWidth/naturalHeight
as the image's size, but this is incorrect for cases:
  1. intrinsicSize attribute overrides naturalWidth/naturalHeight;
  2. srcset w descriptor sizes will determine
     naturalWidth/naturalHeight;

So, instead, we should be using the actual size of the Image object.

Bug: 888578
Change-Id: I2abc9854ffd8c0d942651085d510885a82884ad8
Reviewed-on: https://chromium-review.googlesource.com/1240497Reviewed-by: Steve Kobes <skobes@chromium.org>
Commit-Queue: Luna Lu <loonybear@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593665}