Add Closure extern for toResizableBuffer() (#24704)

Prevents Closure compiler from mangling
`wasmMemory.toResizableBuffer()`.

Author: kleisauke

src/closure-externs/closure-externs.js

@@ -103,6 +103,10 @@ WebAssembly.Instance.prototype.exports;
  * @type {!ArrayBuffer}
  */
 WebAssembly.Memory.prototype.buffer;
+/**
+ * @returns {ArrayBuffer}
+ */
+WebAssembly.Memory.prototype.toResizableBuffer = function() {};
 /**
  * @type {number}
  */