Avoid testing WebCrypto if not supported by the browser.
Avoid testing WebCrypto if not supported by the browser.

dfahlander/Dexie.js,jimmywarting/Dexie.js,jimmywarting/Dexie.js,dfahlander/Dexie.js,dfahlander/Dexie.js,dfahlander/Dexie.js,jimmywarting/Dexie.js,jimmywarting/Dexie.js