Error compiling HttpClient class in signalr.js due to delete method

[failwyn]

ISSUE: Error compiling HttpClient class in signalr.js due to delete method.

TEST CASE: Run the Test NUglify.Tests.JavaScript => Bugs => Bug353 (Fixed in PR#354)

Stack Trace: 
TestHelper.RunErrorTest(String settingsSwitches, JSError[] expectedErrorArray) line 906
TestHelper.RunErrorTest(JSError[] expectedErrorArray) line 700
Bugs.BugXXX() line 18
1) at NUglify.Tests.JavaScript.Common.TestHelper.RunErrorTest(String settingsSwitches, JSError[] expectedErrorArray) in \NUglify\src\NUglify.Tests\JavaScript\Common\TestHelper.cs:line 906
TestHelper.RunErrorTest(JSError[] expectedErrorArray) line 700
Bugs.BugXXX() line 18

Standard Output: 
INPUT FILE: \NUglify\src\NUglify.Tests\bin\Debug\TestData\JS\Input\Bugs\BugXXX.js
class HttpClient {
delete(url, options) {
return this.send({
...options,
method: "DELETE",
url,
});
}
}

---ERRORS---
NoIdentifier

    
    Error JS1010 at Line 2, Column 5: Expected identifier: delete
        Expected identifier: delete
        UNEXPECTED

UNEXPECTED ERROR RESULTS

FIX: Added the following code to JSKeyword.cs

case JSToken.Delete: return "delete";