[webcrypto] Change HMAC key generation length from bytes to bits.

content/child/webcrypto/shared_crypto.cc

Index: content/child/webcrypto/shared_crypto.cc
diff --git a/content/child/webcrypto/shared_crypto.cc b/content/child/webcrypto/shared_crypto.cc
index 580754ae47966343874aee1766ea68b8d2672d52..bbcd9a674a191ab1eab7d7f2448166001381bff2 100644
--- a/content/child/webcrypto/shared_crypto.cc
+++ b/content/child/webcrypto/shared_crypto.cc
@@ -315,15 +315,10 @@ Status GenerateSecretKey(const blink::WebCryptoAlgorithm& algorithm,
       const blink::WebCryptoHmacKeyGenParams* params =
           algorithm.hmacKeyGenParams();
       DCHECK(params);
-#if defined(WEBCRYPTO_HMAC_BITS)
       if (params->hasLengthBits()) {
         if (params->optionalLengthBits() % 8)
           return Status::ErrorGenerateKeyLength();
         keylen_bytes = params->optionalLengthBits() / 8;
-#else
-      if (params->hasLengthBytes()) {
-        keylen_bytes = params->optionalLengthBytes();
-#endif
       } else {
         keylen_bytes = ShaBlockSizeBytes(params->hash().id());
         if (keylen_bytes == 0)