Repurpose {Image,}HasRelativeSize and rename to HasIntrinsicSize

This renames:

  Image::HasRelativeSize,
  StyleImage::ImageHasRelativeSize and
  LayoutImageResource::ImageHasRelativeSize

to the common name HasIntrinsicSize.

This flips the meaning of this flag/method, but the new name is using a
term that is more relatable from a spec-perspective.

Change-Id: I2509926a186f8c81534800362becd585fb0bd024
Reviewed-on: https://chromium-review.googlesource.com/c/1488885
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Commit-Queue: Stephen Chenney <schenney@chromium.org>
Auto-Submit: Fredrik Söderquist <fs@opera.com>
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635550}
19 files changed