Rewrite most `Foo* field_` pointer fields to `raw_ptr<Foo> field_`.

DO NOT REVERT (unless absolutely necessary)! Report build breaks to keishi@(APAC)/glazunov@(EMEA)/sebmarchand@(NA) as soon as you see them. Fixes are expected to be trivial.

This commit was generated automatically, by running the following script: tools/clang/rewrite_raw_ptr_fields/rewrite-multiple-platforms.sh on commit fe74bc434e5b7e92d13a328362fcb6df15d8847e

For more information, see MiraclePtr One Pager [1], the PSA at chromium-dev@ [2], and the raw_ptr documentation in //base/memory/raw_ptr.md.

FYI This CL does not enable MiraclePtr protection and we expect no behavior change from this.

[1] https://docs.google.com/document/d/1pnnOAIz_DMWDI4oIOFoMAqLnf_MZ2GsrJNb_dbQ3ZBg/edit?usp=sharing
[2] https://groups.google.com/a/chromium.org/g/chromium-dev/c/vAEeVifyf78/m/SkBUc6PhBAAJ

Binary-Size: Increase of around 500kb was approved for MiraclePtr
Include-Ci-Only-Tests: true
No-Tree-Checks: true
No-Presubmit: true
Bug: 1272324, 1073933
Change-Id: I05c86a83bbb4b3f4b017f361dd7f4e7437697f69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3305132
Commit-Queue: Keishi Hattori <keishi@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Owners-Override: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/main@{#945735}

diff --git a/ipc/ipc_channel_reader_unittest.cc b/ipc/ipc_channel_reader_unittest.cc
index a3d80dc..c2215bc 100644
--- a/ipc/ipc_channel_reader_unittest.cc
+++ b/ipc/ipc_channel_reader_unittest.cc

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/memory/raw_ptr.h"
 #include "build/build_config.h"
 
 #include <stddef.h>
@@ -57,7 +58,7 @@
   }
 
  private:
-  Message* last_dispatched_message_;
+  raw_ptr<Message> last_dispatched_message_;
   std::string data_;
 };