Make caret height calculation for display:inline-block as same as display:block

This patch change caret height calculation for display:inline-block as same as display:block by calling RenderBlock::lineHeight() with PositionOfInteriorLineBoxes instead of PositionOnContainingLine to avoid including margin height into caret height.

BUG=314223
TEST=LayoutTests/editing/caret/caret-in-inline-block.html

Review URL: https://codereview.chromium.org/65143006

git-svn-id: svn://svn.chromium.org/blink/trunk@161778 bbb929c8-8fbe-4397-9dbb-9b2b20218538