Cleanup: rename usage_mask --> usages.

content/child/webcrypto/nss/rsa_oaep_nss.cc

Index: content/child/webcrypto/nss/rsa_oaep_nss.cc
diff --git a/content/child/webcrypto/nss/rsa_oaep_nss.cc b/content/child/webcrypto/nss/rsa_oaep_nss.cc
index d129eaca6fa9519330679168898380f53a80218c..55501b36f9f1842cf929b882ec1336b054eaaac0 100644
--- a/content/child/webcrypto/nss/rsa_oaep_nss.cc
+++ b/content/child/webcrypto/nss/rsa_oaep_nss.cc
@@ -170,23 +170,22 @@ class RsaOaepImplementation : public RsaHashedAlgorithm {
 
   virtual Status GenerateKey(const blink::WebCryptoAlgorithm& algorithm,
                              bool extractable,
-                             blink::WebCryptoKeyUsageMask usage_mask,
+                             blink::WebCryptoKeyUsageMask usages,
                              GenerateKeyResult* result) const override {
     Status status = NssSupportsRsaOaep();
     if (status.IsError())
       return status;
     return RsaHashedAlgorithm::GenerateKey(
-        algorithm, extractable, usage_mask, result);
+        algorithm, extractable, usages, result);
   }
 
   virtual Status VerifyKeyUsagesBeforeImportKey(
       blink::WebCryptoKeyFormat format,
-      blink::WebCryptoKeyUsageMask usage_mask) const override {
+      blink::WebCryptoKeyUsageMask usages) const override {
     Status status = NssSupportsRsaOaep();
     if (status.IsError())
       return status;
-    return RsaHashedAlgorithm::VerifyKeyUsagesBeforeImportKey(format,
-                                                              usage_mask);
+    return RsaHashedAlgorithm::VerifyKeyUsagesBeforeImportKey(format, usages);
   }
 
   virtual const char* GetJwkAlgorithm(