
These IPCs hold this param as a gfx::Rect and the RenderWidget and RenderView set the size. On the receiving end, the size is sometimes used so initial_pos was a misnomer. This is a mechanical rename, there should be no functional difference. TBR= BUG= Review URL: https://codereview.chromium.org/889403004 Cr-Commit-Position: refs/heads/master@{#314430}