Deprecate ClearedCount

This will be removed in a future release along with the rest of the "cleared" API

PiperOrigin-RevId: 504344009

src/google/protobuf/repeated_field_unittest.cc

@@ -1514,6 +1514,7 @@ TEST(RepeatedPtrField, ReserveDoesntLoseAllocated) {
 // Clearing elements is tricky with RepeatedPtrFields since the memory for
 // the elements is retained and reused.
 TEST(RepeatedPtrField, ClearedElements) {
+  PROTOBUF_IGNORE_DEPRECATION_START
   RepeatedPtrField<std::string> field;
 
   std::string* original = field.Add();
@@ -1540,7 +1541,6 @@ TEST(RepeatedPtrField, ClearedElements) {
   field.Clear();
   EXPECT_EQ(field.ClearedCount(), 2);
 #ifndef PROTOBUF_FUTURE_REMOVE_CLEARED_API
-  PROTOBUF_IGNORE_DEPRECATION_START
   EXPECT_EQ(field.ReleaseCleared(), original);  // Take ownership again.
   EXPECT_EQ(field.ClearedCount(), 1);
   EXPECT_NE(field.Add(), original);
@@ -1552,8 +1552,8 @@ TEST(RepeatedPtrField, ClearedElements) {
   EXPECT_EQ(field.ClearedCount(), 1);
   EXPECT_EQ(field.Add(), original);
   EXPECT_EQ(field.ClearedCount(), 0);
-  PROTOBUF_IGNORE_DEPRECATION_STOP
 #endif  // !PROTOBUF_FUTURE_REMOVE_CLEARED_API
+  PROTOBUF_IGNORE_DEPRECATION_STOP
 }
 
 // Test all code paths in AddAllocated().

src/google/protobuf/repeated_ptr_field.h

@@ -1144,7 +1144,9 @@ class RepeatedPtrField final : private internal::RepeatedPtrFieldBase {
 
   // Gets the number of cleared objects that are currently being kept
   // around for reuse.
+  ABSL_DEPRECATED("This will be removed in a future release")
   int ClearedCount() const;
+
 #ifndef PROTOBUF_FUTURE_REMOVE_CLEARED_API
   // Adds an element to the pool of cleared objects, passing ownership to
   // the RepeatedPtrField.  The element must be cleared prior to calling