Remove DesktopFrame::shape().
Remove DesktopFrame::shape().

Frame shape is no longer used and can be removed.

R=jamiewalch@chromium.org

Review URL: https://codereview.webrtc.org/1986963002 .

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#12783}

TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc