Sanitize inheritance in callers of utils.expose

chrome/renderer/resources/extensions/enterprise_platform_keys/subtle_crypto.js

Index: chrome/renderer/resources/extensions/enterprise_platform_keys/subtle_crypto.js
diff --git a/chrome/renderer/resources/extensions/enterprise_platform_keys/subtle_crypto.js b/chrome/renderer/resources/extensions/enterprise_platform_keys/subtle_crypto.js
index c53bec335d50729143fb7d60fe6edfa5aafab132..8c2d9ccd7cb643fa146e253ea54d1b010db8933e 100644
--- a/chrome/renderer/resources/extensions/enterprise_platform_keys/subtle_crypto.js
+++ b/chrome/renderer/resources/extensions/enterprise_platform_keys/subtle_crypto.js
@@ -16,7 +16,7 @@ var normalizeAlgorithm =
 // This error is thrown by the internal and public API's token functions and
 // must be rethrown by this custom binding. Keep this in sync with the C++ part
 // of this API.
-var errorInvalidToken = "The token is not valid.";
+var errorInvalidToken = 'The token is not valid.';
 
 // The following errors are specified in WebCrypto.
 // TODO(pneubeck): These should be DOMExceptions.
@@ -73,12 +73,14 @@ function equalsStandardPublicExponent(array) {
 /**
  * Implementation of WebCrypto.SubtleCrypto used in enterprise.platformKeys.
  * Derived from platformKeys.SubtleCrypto.
+ *
  * @param {string} tokenId The id of the backing Token.
  * @constructor
  */
-var EnterpriseSubtleCryptoImpl = function(tokenId) {
-  SubtleCryptoImpl.call(this, tokenId);
-};
+function EnterpriseSubtleCryptoImpl(tokenId) {
+  $Function.call(SubtleCryptoImpl, this, tokenId);
+}
+$Object.setPrototypeOf(EnterpriseSubtleCryptoImpl, null);
 
 EnterpriseSubtleCryptoImpl.prototype =
     Object.create(SubtleCryptoImpl.prototype);