Allow custom comparators for the MRUCache

base/containers/mru_cache.h

Index: base/containers/mru_cache.h
diff --git a/base/containers/mru_cache.h b/base/containers/mru_cache.h
index 6c1d6260f55b26168a736b5d09a72e34f0644a16..4005489d4b285a8716452869b7688dea362689bf 100644
--- a/base/containers/mru_cache.h
+++ b/base/containers/mru_cache.h
@@ -209,10 +209,12 @@ class MRUCacheBase {
 
 // A container that does not do anything to free its data. Use this when storing
 // value types (as opposed to pointers) in the list.
-template <class KeyType, class PayloadType>
-class MRUCache : public MRUCacheBase<KeyType, PayloadType, std::less<KeyType>> {
+template <class KeyType,
+          class PayloadType,
+          class CompareType = std::less<KeyType>>
+class MRUCache : public MRUCacheBase<KeyType, PayloadType, CompareType> {
  private:
-  using ParentType = MRUCacheBase<KeyType, PayloadType, std::less<KeyType>>;
+  using ParentType = MRUCacheBase<KeyType, PayloadType, CompareType>;
 
  public:
   // See MRUCacheBase, noting the possibility of using NO_AUTO_EVICT.