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

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

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=hiramahmood@google.com

Bug: 371316188
Change-Id: Ibc02facde40e5f45fdd00ea17d0169a9f267bc44
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5918614
Auto-Submit: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Hira Mahmood <hiramahmood@google.com>
Commit-Queue: Hira Mahmood <hiramahmood@google.com>
Cr-Commit-Position: refs/heads/main@{#1366173}