fixup: remove redundant check

lib/internal/repl/await.js

@@ -8,6 +8,10 @@ const {
   ArrayPrototypePush,
   FunctionPrototype,
   ObjectKeys,
+  StringPrototypeEndsWith,
+  StringPrototypeIncludes,
+  StringPrototypeReplace,
+  StringPrototypeSplit,
   SyntaxError,
 } = primordials;
 
@@ -110,20 +114,18 @@ function processTopLevelAwait(src) {
     // Convert keyword parse errors on await into their original errors when
     // possible.
     if (errPos === awaitPos + 6 &&
-        src.slice(errPos - 6, errPos - 1) === 'await' &&
-        e.message.includes('Expecting Unicode escape sequence'))
+        StringPrototypeIncludes(e.message, 'Expecting Unicode escape sequence'))
       return null;
     if (errPos === awaitPos + 7 &&
-        src.slice(errPos - 7, errPos - 2) === 'await' &&
-        e.message.includes('Unexpected token'))
+        StringPrototypeIncludes(e.message, 'Unexpected token'))
       return null;
     const { line, column } = e.loc;
-    let message = '\n' + src.split('\n')[line - 2] + '\n';
+    let message = '\n' + StringPrototypeSplit(src, '\n')[line - 2] + '\n';
     let i = 0;
     while (i++ < column) message += ' ';
-    message += '^\n\n' + e.message.replace(/ \([^)]+\)/, '');
+    message += '^\n\n' + StringPrototypeReplace(e.message, / \([^)]+\)/, '');
     // V8 unexpected token errors include the token string.
-    if (message.endsWith('Unexpected token'))
+    if (StringPrototypeEndsWith(message, 'Unexpected token'))
       message += " '" + src[e.pos - wrapPrefix.length] + "'";
     // eslint-disable-next-line no-restricted-syntax
     throw new SyntaxError(message);