content/static/js: remove guessKind

Fixes golang/go#42957

Change-Id: I273ed33ae2c9a57632a9870864bc962e2e0d4b8c
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/274953
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>

content/static/js/jump.js

@@ -92,9 +92,6 @@ function newJumpListItem(el) {
   a.setAttribute('href', '#' + name);
   a.setAttribute('tabindex', '-1');
   let kind = el.getAttribute('data-kind');
-  if (!kind) {
-    kind = guessKind(el);
-  }
   return {
     link: a,
     name: name,
@@ -103,32 +100,6 @@ function newJumpListItem(el) {
   };
 }
 
-// guessKind tries to guess the kind of el by looking around the DOM.
-// TODO(https://golang.org/issue/42957): remove.
-function guessKind(el) {
-  switch (el.getAttribute('class')) {
-    case 'Documentation-functionHeader':
-    case 'Documentation-typeFuncHeader':
-      return 'function';
-    case 'Documentation-typeHeader':
-      return 'type';
-    case 'Documentation-typeMethodHeader':
-      return 'method';
-    default:
-      const sec = el.closest('section');
-      switch (sec.getAttribute('class')) {
-        case 'Documentation-variables':
-          return 'variable';
-        case 'Documentation-constants':
-          return 'constant';
-        case 'Documentation-types':
-          return 'field';
-        default:
-          return '';
-      }
-  }
-}
-
 let lastFilterValue; // The last contents of the filter text box.
 let activeJumpItem = -1; // The index of the currently active item in the list.