Fix leaked raw_ptr/raw_ref in BraveOriginService (#34275)

Override KeyedService::Shutdown() to clean up raw_ptr members and
invalidate weak pointers before the service is destroyed. Without
this, the defaulted destructor detects dangling raw_ptr references
to PrefService and PolicyService objects that are already freed
during the profile teardown sequence.

Resolves brave/brave-browser#52757

Author: netzenbot

components/brave_origin/brave_origin_service.cc

@@ -53,6 +53,15 @@ BraveOriginService::BraveOriginService(
 
 BraveOriginService::~BraveOriginService() = default;
 
+void BraveOriginService::Shutdown() {
+  weak_ptr_factory_.InvalidateWeakPtrs();
+  skus_service_.reset();
+  local_state_ = nullptr;
+  profile_prefs_ = nullptr;
+  profile_policy_service_ = nullptr;
+  browser_policy_service_ = nullptr;
+}
+
 bool BraveOriginService::IsPolicyControlledByBraveOrigin(
     std::string_view policy_key) const {
   if (!IsBraveOriginEnabled()) {

components/brave_origin/brave_origin_service.h

@@ -35,6 +35,9 @@ class BraveOriginService : public KeyedService {
                               policy::PolicyService* browser_policy_service);
   ~BraveOriginService() override;
 
+  // KeyedService:
+  void Shutdown() override;
+
   // Check if a policy is controlled by BraveOrigin
   bool IsPolicyControlledByBraveOrigin(std::string_view policy_key) const;