Throw a DataError rather than OperationError in some cases when importing invalid EC key.

content/test/data/webcrypto/bad_ec_keys.json

 // This file contains incorrect key data in a variety of formats.
 //   "key" -- either a dictionary for JWK, or hex encoded bytes for PKCS8/SPKI.
 //   "key_format" -- one of: "jwk", "pkcs8", "spki"
 //   "error" -- The expected rejection reason when importing the key.
 [
 // --------------------------------------------------------------------------
 // Bad public keys
 // --------------------------------------------------------------------------
 // TODO(eroman): Group the bad public keys by format type.
 
@@ skipping 51 matching lines @@
   // Import Error: Invalid key (x was corrupted)
   {
     "crv": "P-256",
     "key_format": "jwk",
     "key": {
       "kty": "EC",
       "crv": "P-256",
       "x": "nLPPaTA9r8dh1ORoe07PA55tNKuWSvgIENjVWKSo1vc",
       "y": "LVEjOheIkgqG7gihlix576MX-3h54pfa0hRtuZX6HHg"
     },
-    "error": "OperationError"
+    "error": "DataError"
   },
 
   // Import Error: Incorrect kty.
   {
     "crv": "P-384",
     "key_format": "jwk",
     "key": {
       "kty": "RSA",
       "crv": "P-384",
       "x": "hqwS3Qp_5bgf2uhrEkNdMW75OSo_ULMHq2XZxged0NLYGdwJ4ihhRZwu2Z-6tm-u",
@@ skipping 113 matching lines @@
   {
     "crv": "P-384",
     "key_format": "jwk",
     "key": {
       "kty": "EC",
       "crv": "P-384",
       "d": "pJLOj6kAhMIn4aMveXTTnp_2en6HBew0GbNftgdYK-vUYeCxUgrHbsLdTptj665x",
       "x": "5V_ubEnY1SP1znv5wEJc5P9lBwi33lz7CVkBUjl5p_BCYC2zCFRzU2mBO1w_Xvho",
       "y": "KPWcxdxQlJKpiNOKjiUZ3j0MT9D72wmT448YUGwXYGxeJCSSRvHOlJg6U2HFvpg-"
     },
-    "error": "OperationError"
+    "error": "DataError"
   },
 
 // --------------------------------------------------------------------------
 // Bad private keys (PKCS8)
 // --------------------------------------------------------------------------
   
   // The private key is exactly equal to the order, and the public key is
   // private key * order.
   {
     "crv": "P-256",
@@ skipping 22 matching lines @@
 
   // The private key is exactly equal to the order + 11, and the public key is
   // omitted.
   {
     "crv": "P-521",
     "key_format": "pkcs8",
     "key": "3060020100301006072A8648CE3D020106052B8104002304493047020101044201FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA51868783BF2F966B7FCC0148F709A5D03BB5C9B8899C47AEBB6FB71E91386414",
     "error": "DataError: The imported EC key is invalid"
   }
 ]