Revert "Automated T* -> raw_ptr<T> rewrite "refresh""

This reverts commit e407f3d9855a6a063eb8ea661a12b3f9d0a1e228.

Reason for revert: Cause of crbug.com/1518884

Original change's description:
> Automated T* -> raw_ptr<T> rewrite "refresh"
>
> PS1: automated rewrite
> PS2-PS5,PS7: unrewrite to fix compilation
> PS6,PS22: unrewrite non-automated exclusions
> PS8-PS20: apply DanglingUntriaged
> PS21: unrewrite to undo binary size increase
> PS23: remove no-longer-needed RAW_PTR_EXCLUSION, #includes & comments
>
> The code has changed since the "big rewrite" so some exclusions no
> longer apply. But also, the rewriter changed too:
> - No longer applies constexpr-related exclusions (raw_ptr<> support
>   was added)
> - union exclusion has been waived for std::optional and absl::variant,
>   since they invoke raw_ptr<>'s ctor/dtor correctly
> - Certain paths under //base are no longer need to be excluded, as
>   PartitionAlloc/raw_ptr no longer depends on them
>
> This CL also tries to popularize a better format of exclusion reasoning
> comments, e.g.:
>   // RAW_PTR_EXCLUSION: #addr-of, #global-scope
>   // RAW_PTR_EXCLUSION: Performance reasons ...
>   // RAW_PTR_EXCLUSION: #addr-of; Also: Another reason
> One comment per block of fields will suffice, if the reason is the
> same throughout, and no other comments are added in between.
> This format has advantages, like brevity (no more "not a raw_ptr<>
> because" blurb), and improved scriptability.
>
> Bug: 1446392
> Change-Id: I784ff0e461b2105bc01ad7b8570bb462613b24ce
> DanglingUntriaged-notes: automated rewrite.
> AX-Relnotes: n/a.
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5190661
> Reviewed-by: Keishi Hattori <keishi@chromium.org>
> Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
> Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
> Owners-Override: Keishi Hattori <keishi@chromium.org>
> Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/main@{#1247373}

Bug: 1446392, 1518884
Change-Id: I7e5bbd0f4cbd5731ffa2cfaa24c76b17881960c3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5201861
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Tsuyoshi Horo <horo@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1247869}