components: default the user-defined empty ctor and dtor where possible

I need an owner's approval please for changes under:
components/no_state_prefetch

This is a mechanical change. There are a few instances (but not all)
of empty user-defined constructors and destructors which can be
defaulted in the /components code.

This CL was uploaded by git cl split.

R=ryansturm@chromium.org

Bug: 371316188
Change-Id: I910821eb51133d6d7d3fddd57a8c54c04b13db5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5918021
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Auto-Submit: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1365924}