Add sandbox/win to rewrite_raw_ptr_fields ignore list

This CL add sandbox/win to rewrite_raw_ptr_fields ignore list as partition_alloc isn't built with the sandbox and gives link errors.

Bug: 1080832
Change-Id: I8cb1d1fc0cf04e868db342d1e907851f374ce530
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518302
Commit-Queue: Keishi Hattori <keishi@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831408}

tools/clang/rewrite_raw_ptr_fields/manual-paths-to-ignore.txt

@@ -27,6 +27,9 @@ net/tools/
 chrome/chrome_elf/
 chrome/installer/mini_installer/
 
+# Exclude pocdll.dll asnit doesn't depend on //base and only used for testing.
+sandbox/win/sandbox_poc/pocdll
+
 # The folder holds headers that are duplicated in the Android source and need to
 # provide a stable C ABI. Can't depend on //base.
 android_webview/public/