Don't pass data to jshint via STDIN

Summary: Fixes T7464. JSHint is unable to exclude files from linting (via the `jshintignore` file) if the data is piped through `STDIN`. An alternative would be to pass `$options[] = '--filename='.$this->getActivePath()`, but `$this->getActivePath()` is not set when the command arguments are constructed.

Test Plan: Created a file and linted it with `ArcanistJSHintLinter`. Was able to exclude the file from linting with a `jshintignore` file.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T7464

Differential Revision: https://secure.phabricator.com/D12298

src/lint/linter/ArcanistJSHintLinter.php

@@ -73,14 +73,6 @@ final class ArcanistJSHintLinter extends ArcanistExternalLinter {
     return pht('Install JSHint using `npm install -g jshint`.');
   }
 
-  public function supportsReadDataFromStdin() {
-    return true;
-  }
-
-  public function getReadDataFromStdinFilename() {
-    return '-';
-  }
-
   protected function getMandatoryFlags() {
     $options = array();