fix(op_crate/web): fix atob to throw spec aligned DOMException (#8798)

cli/tests/unit/text_encoding_test.ts

@@ -50,6 +50,21 @@ unitTest(function atobThrows2(): void {
   assert(threw);
 });
 
+unitTest(function atobThrows3(): void {
+  let threw = false;
+  try {
+    atob("foobar!!");
+  } catch (e) {
+    if (
+      e instanceof DOMException &&
+      e.toString().startsWith("InvalidCharacterError:")
+    ) {
+      threw = true;
+    }
+  }
+  assert(threw);
+});
+
 unitTest(function btoaFailed(): void {
   const text = "你好";
   assertThrows(() => {

op_crates/web/08_text_encoding.js

@@ -105,7 +105,7 @@
     if (rem === 1 || /[^+/0-9A-Za-z]/.test(s)) {
       throw new DOMException(
         "The string to be decoded is not correctly encoded",
-        "DataDecodeError",
+        "InvalidCharacterError",
       );
     }