Exclude KeyedServiceBaseFactory::service_name_ in rewrite_raw_ptr_fields

KeyedServiceBaseFactory::service_name_ is used in decltype() to check that the types match.

Bug: 1073933
Change-Id: I8b3380c0c4e33e937d7da817b892dd86b530e4a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2542937Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Commit-Queue: Keishi Hattori <keishi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828309}

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

@@ -119,6 +119,7 @@ iovec::iov_base  # requires adding .get() in another repository, used e.g. in
 net::SockaddrStorage::addr  # .get() not added in reinterpret_cast, reason unknown
 views::internal::ClassPropertyValueSetter::property_  # passed to templated param T*
 (anonymous namespace)::ScopedFunctionHelper::function_  # function pointer template
+KeyedServiceBaseFactory::service_name_ # used in decltype
 
 #######
 # CheckedPtr2/MTECheckedPtr-specific sections