[NTP] Fix RESIZE_TIMEOUT_DURATION vs RESIZE_TIMEOUT_DELAY

The declaration and reference of the variable used two
different names resulting in a console error, and presumably
incorrect behavior.

Bug: None
Change-Id: I94503c1dfa28b02efaf78f52762554d32672dff5
Reviewed-on: https://chromium-review.googlesource.com/c/1257664Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596023}

chrome/browser/resources/local_ntp/most_visited_single.js

@@ -995,7 +995,7 @@ var init = function() {
     resizeTimeout = window.setTimeout(() => {
       resizeTimeout = null;
       updateTileVisibility();
-    }, RESIZE_TIMEOUT_DURATION);
+    }, RESIZE_TIMEOUT_DELAY);
   };
 
   window.addEventListener('message', handlePostMessage);