Remove includes of callback_forward.h from .cc files

Generally, .cc files should not be forward declaring base::OnceCallback
and related classes. If they are using Callbacks, they should include
callback.h instead. So treat the base/functional/callback_forward.h
includes as superfluous and remove them.

Bug: 40318405
Change-Id: I487c907e520d03be3db5b03a8757c7f2559c8278
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7201005
Commit-Queue: Lei Zhang <[email protected]>
Owners-Override: Kyle Charbonneau <[email protected]>
Reviewed-by: Kyle Charbonneau <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1550173}
NOKEYCHECK=True
GitOrigin-RevId: 16723c112a9691d3819d7117e2faf2aeecf1891a
1 file changed