diff --git a/third_party/blink/renderer/core/resource_pool_limiter/resource_pool_limiter.cc b/third_party/blink/renderer/core/resource_pool_limiter/resource_pool_limiter.cc
index 54e30f11416..352b5c4a1cb 100644
--- a/third_party/blink/renderer/core/resource_pool_limiter/resource_pool_limiter.cc
+++ b/third_party/blink/renderer/core/resource_pool_limiter/resource_pool_limiter.cc
@@ -85,7 +85,7 @@ ResourcePoolLimiter::IssueResourceInUseTracker(
   String resource_id = GetResourceIdInUse(
       GetTopFrameOrContextSecurityOrigin(context), resource_type);
 
-  MutexLocker locker(resources_in_use_lock_);
+  base::AutoLock locker(resources_in_use_lock_);
   // `insert` doesn't change the value if it already exists.
   int& resource_in_use_count =
       resources_in_use_.insert(resource_id, 0).stored_value->value;
@@ -99,7 +99,7 @@ ResourcePoolLimiter::IssueResourceInUseTracker(
 
 void ResourcePoolLimiter::DropResourceInUse(
     const ResourceInUseTracker* resource_in_use_tracker) {
-  MutexLocker locker(resources_in_use_lock_);
+  base::AutoLock locker(resources_in_use_lock_);
   auto resource_in_use_it =
       resources_in_use_.find(resource_in_use_tracker->resource_id());
   DCHECK(resource_in_use_it != resources_in_use_.end());
diff --git a/third_party/blink/renderer/core/resource_pool_limiter/resource_pool_limiter.h b/third_party/blink/renderer/core/resource_pool_limiter/resource_pool_limiter.h
index ebc994629da..e1303354e72 100644
--- a/third_party/blink/renderer/core/resource_pool_limiter/resource_pool_limiter.h
+++ b/third_party/blink/renderer/core/resource_pool_limiter/resource_pool_limiter.h
@@ -9,11 +9,11 @@
 #include <memory>
 #include <utility>
 
+#include "base/synchronization/lock.h"
 #include "third_party/blink/renderer/core/core_export.h"
 #include "third_party/blink/renderer/platform/wtf/hash_map.h"
 #include "third_party/blink/renderer/platform/wtf/text/string_hash.h"
 #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
-#include "third_party/blink/renderer/platform/wtf/threading_primitives.h"
 
 namespace blink {
 
@@ -51,8 +51,8 @@ class CORE_EXPORT ResourcePoolLimiter {
 
   void DropResourceInUse(const ResourceInUseTracker* resource_in_use_tracker);
 
-  Mutex resources_in_use_lock_;
-  HashMap<String, int> resources_in_use_;
+  base::Lock resources_in_use_lock_;
+  HashMap<String, int> resources_in_use_ GUARDED_BY(resources_in_use_lock_);
 };
 
 }  // namespace blink