web_dev_style: add check for ending jsdoc comments with **/ instead of */.

chrome/browser/resources/web_dev_style/js_checker.py

Index: chrome/browser/resources/web_dev_style/js_checker.py
diff --git a/chrome/browser/resources/web_dev_style/js_checker.py b/chrome/browser/resources/web_dev_style/js_checker.py
index 860c27bfa4e861b48b085fc7de04d1fec4308cd7..6e2e10ea271883dbc7e246aade81b3ae7128bd00 100644
--- a/chrome/browser/resources/web_dev_style/js_checker.py
+++ b/chrome/browser/resources/web_dev_style/js_checker.py
@@ -50,6 +50,12 @@ class JSChecker(object):
     return self.RegexCheck(i, line, r'(?:^|\s|\()(const)\s',
         'Use /** @const */ var varName; instead of const varName;')
 
+  def EndJsDocCommentCheck(self, i, line):
+    msg = 'End JSDoc comments with */ instead of **/'
+    def _check(regex):
+      return self.RegexCheck(i, line, regex, msg)
+    return _check(r'^\s*(\*\*/)\s*$') or _check(r'/\*\* @[a-zA-Z]+.* (\*\*/)')
+
   def GetElementByIdCheck(self, i, line):
     """Checks for use of 'document.getElementById' instead of '$'."""
     return self.RegexCheck(i, line, r"(document\.getElementById)\('",