Don't pushState when setting the search page to itself.

chrome/browser/resources/options/search_page.js

Index: chrome/browser/resources/options/search_page.js
diff --git a/chrome/browser/resources/options/search_page.js b/chrome/browser/resources/options/search_page.js
index 5706863c6818fad27a63095438ccad9d70ef4375..0152017b9fae2c119308020c7dd6905107ba86ef 100644
--- a/chrome/browser/resources/options/search_page.js
+++ b/chrome/browser/resources/options/search_page.js
@@ -267,10 +267,12 @@ cr.define('options', function() {
       // Cleanup the search query string.
       text = SearchPage.canonicalizeQuery(text);
 
-      // Set the hash on the current page, and the enclosing uber page
+      // Set the hash on the current page, and the enclosing uber page. Only do
+      // this if the page is not current. See https://crbug.com/401004.
       var hash = text ? '#' + encodeURIComponent(text) : '';
       var path = text ? this.name : '';
-      uber.pushState({}, path + hash);
+      if (location.hash != hash || location.pathname != '/' + path)
+        uber.pushState({}, path + hash);
 
       // Toggle the search page if necessary.
       if (text) {