DanglingPointer: annotate for unittests base+linux [1/N]

The DanglingPointerDetector is configured only when the test enters the
ContentMain function. See https://crbug.com/1400059

I would like to configure it no matter the kind of test. For this to
happen, we need to annotate every pre-existing dangling pointers.

This patch annotates the ones you can find by running targets depending
on the GoogleTest library.

Statistic:

This adds 1776 new DanglingUntriaged. Among them:
- 1288 are in unittests.
- 488 are in implementation.

To produce those numbers, I used the command:
```bash
git diff annotate-linux origin/main -- "*test*" | grep "DanglingUntriaged" | wc -l
```

This patch has been generated by:

1. Apply the "auto-annotator" patch:
   https://chromium-review.googlesource.com/c/chromium/src/+/4474553

2. Compile the compiler again:
   ```bash
   ./tools/clang/scripts/build.py
   ```

3. List and run all the targets. You can use a bash script like:
   https://docs.google.com/document/d/1AMMERcqy0eafFWopUCHYsIKIKEp3J8DFxqW9UIbzIHo

4. Concatenate output, filter by "Found dangling ptr", sort, remove
   duplicate.

5. Apply the rewriter script from:
   https://github.com/ArthurSonzogni/chrome-dangling-ptr-apply-edit

6. Revert the "auto-annotate" patch.

7. Apply `git cl format`

AX-Relnotes: n/a.
Bug: chromium:1400059
Change-Id: I217d5c0b925da5176fc53baf95919a3690f1e9a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4570424
Reviewed-by: danakj <[email protected]>
Owners-Override: danakj <[email protected]>
Commit-Queue: Arthur Sonzogni <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1151859}
diff --git a/components/visitedlink/test/visitedlink_unittest.cc b/components/visitedlink/test/visitedlink_unittest.cc
index 10061132..e00784c 100644
--- a/components/visitedlink/test/visitedlink_unittest.cc
+++ b/components/visitedlink/test/visitedlink_unittest.cc
@@ -734,8 +734,8 @@
   void DeleteRenderProcessHosts() { processes_.clear(); }
 
  private:
-  raw_ptr<content::RenderProcessHostCreationObserver> creation_observer_ =
-      nullptr;
+  raw_ptr<content::RenderProcessHostCreationObserver, DanglingUntriaged>
+      creation_observer_ = nullptr;
 
   std::list<std::unique_ptr<VisitRelayingRenderProcessHost>> processes_;
   std::unique_ptr<VisitCountingContext> context_;