pw_varint: remove legacy kMaxVarintSizeBytes

Removes pw::varint::kMaxVarintSizeBytes now that users have been
moved to kMaxVarint64SizeBytes.

Change-Id: Ibb49faee3adea48c14d1f09aa5bac028559b9f42
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/18741
Reviewed-by: Wyatt Hepler <hepler@google.com>
Commit-Queue: Ewout van Bekkum <ewout@google.com>
diff --git a/pw_varint/public/pw_varint/varint.h b/pw_varint/public/pw_varint/varint.h
index 103e000..1b09bb2 100644
--- a/pw_varint/public/pw_varint/varint.h
+++ b/pw_varint/public/pw_varint/varint.h
@@ -52,9 +52,6 @@
 PW_INLINE_VARIABLE constexpr size_t kMaxVarint32SizeBytes = 5;
 PW_INLINE_VARIABLE constexpr size_t kMaxVarint64SizeBytes = 10;
 
-// TODO(ewout): deprecate use of this constant.
-PW_INLINE_VARIABLE constexpr size_t kMaxVarintSizeBytes = kMaxVarint64SizeBytes;
-
 // ZigZag encodes a signed integer. This maps small negative numbers to small,
 // unsigned positive numbers, which improves their density for LEB128 encoding.
 //