Simplify CSSStyleImageValue::ElementSize

Call IntrinsicSize() rather than intrinsicWidth()+intrinsicHeight().

Change-Id: Ia9711584d470bd1930dfd25984ad1ddd25976e24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2506436
Commit-Queue: Anders Hartvoll Ruud <andruud@chromium.org>
Auto-Submit: Fredrik Söderquist <fs@opera.com>
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822146}

third_party/blink/renderer/core/css/cssom/css_style_image_value.cc

@@ -36,8 +36,7 @@ double CSSStyleImageValue::intrinsicRatio(bool& is_null) const {
 FloatSize CSSStyleImageValue::ElementSize(
     const FloatSize& default_object_size,
     const RespectImageOrientationEnum) const {
-  bool not_used;
-  return FloatSize(intrinsicWidth(not_used), intrinsicHeight(not_used));
+  return FloatSize(IntrinsicSize().value_or(IntSize()));
 }
 
 }  // namespace blink