Forward GetForBrowserState() getters in keyed services.

For every keyed service with a GetForBrowserState() getter, this CL
adds a GetForProfile() getter as the authoritative implementation and
updates GetForBrowserState() to forward to this method.

Also:

* The GetForBrowserState params are changed to be "ProfileIOS* profile".
* In many cases, the ordering of methods in the keyed service header
  are standardized and spurious comments are removed.
* In many cases, comments referencing browser states are updated to
  reference profiles.
* ReadingListModelFactory::GetAsDualReadingListModelForBrowserState is
  migrated (all call sites updated) to ...ModelForProfile().
* Other small cleanups.

Low-Coverage-Reason: LARGE_SCALE_REFACTOR
Bug: 358335594
Change-Id: Ia311af293cd8be10c7a895e44a730a0ee817875b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5841773
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: Aliona Dangla <alionadangla@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1353972}