Fix 2 ClangTidy - Readability/Naming findings in core/fdrm

* function 'CRYPT_AESDecrypt' has a definition with different parameter
  names
* function 'CRYPT_AEDEncrypt' has a definition with different parameter
  names

PiperOrigin-RevId: 254761931
Change-Id: I67a5ae568daeb272f17e1bb987e35eca6fca2d33
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/56832
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/core/fdrm/fx_crypt_aes.cpp b/core/fdrm/fx_crypt_aes.cpp
index 3397574..4f10945 100644
--- a/core/fdrm/fx_crypt_aes.cpp
+++ b/core/fdrm/fx_crypt_aes.cpp
@@ -644,13 +644,13 @@
 void CRYPT_AESDecrypt(CRYPT_aes_context* context,
                       uint8_t* dest,
                       const uint8_t* src,
-                      uint32_t len) {
-  aes_decrypt_cbc(dest, src, len, context);
+                      uint32_t size) {
+  aes_decrypt_cbc(dest, src, size, context);
 }
 
 void CRYPT_AESEncrypt(CRYPT_aes_context* context,
                       uint8_t* dest,
                       const uint8_t* src,
-                      uint32_t len) {
-  aes_encrypt_cbc(dest, src, len, context);
+                      uint32_t size) {
+  aes_encrypt_cbc(dest, src, size, context);
 }