refactor(op_crates/web): remove unused code path in TextEncoder (deno…

…land#10104)

According to
https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder,
TextEncoder should ignore the "encoding" parameter and always use
"utf-8".

op_crates/web/08_text_encoding.js

@@ -4212,25 +4212,8 @@
  class TextEncoder {
  encoding = "utf-8";
  encode(input = "") {
- input = String(input);
  // Deno.core.encode() provides very efficient utf-8 encoding
- if (this.encoding === "utf-8") {
- return core.encode(input);
- }
-
- const encoder = new UTF8Encoder();
- const inputStream = new Stream(stringToCodePoints(input));
- const output = [];
-
- while (true) {
- const result = encoder.handler(inputStream.read());
- if (result === "finished") {
- break;
- }
- output.push(...result);
- }
-
- return new Uint8Array(output);
+ return core.encode(String(input));
  }
  encodeInto(input, dest) {
  if (!(dest instanceof Uint8Array)) {