Remove stale IPC.

ViewHostMsg_DidCommitAndDrawCompositorFrame and
ViewHostMsg_DidFirstVisuallyNonEmptyPaint don't seem
to be used anywhere ... removing them.

Likely these got orphaned by
https://chromium-review.googlesource.com/c/chromium/src/+/1278285 .

Bug: none
Change-Id: Id58e93c97ca66761238a874afcac3e04c6df09b8
Reviewed-on: https://chromium-review.googlesource.com/c/1351576
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611170}

content/common/view_messages.h

@@ -313,13 +313,6 @@ IPC_MESSAGE_CONTROL1(ViewHostMsg_UserMetricsRecordAction,
 IPC_MESSAGE_CONTROL1(ViewHostMsg_MediaLogEvents,
                      std::vector<media::MediaLogEvent> /* events */)
 
-// Sent once a paint happens after the first non empty layout. In other words,
-// after the frame widget has painted something.
-IPC_MESSAGE_ROUTED0(ViewHostMsg_DidFirstVisuallyNonEmptyPaint)
-
-// Sent once the RenderWidgetCompositor issues a draw command.
-IPC_MESSAGE_ROUTED0(ViewHostMsg_DidCommitAndDrawCompositorFrame)
-
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.