fix(blob): added a check to make sure the Blob class is available in the browser's global scope; (#5548)

lib/platform/browser/classes/Blob.js

@@ -0,0 +1,3 @@
+'use strict'
+
+export default typeof Blob !== 'undefined' ? Blob : null

lib/platform/browser/index.js

@@ -1,5 +1,6 @@
 import URLSearchParams from './classes/URLSearchParams.js'
 import FormData from './classes/FormData.js'
+import Blob from './classes/Blob.js'
 
 /**
  * Determine if we're running in a standard browser environment