history: left/right arrow should change focus even when history is read-only.

chrome/browser/resources/history/history.js

Index: chrome/browser/resources/history/history.js
diff --git a/chrome/browser/resources/history/history.js b/chrome/browser/resources/history/history.js
index 9c5807789a87389cef8b4acc18e17f3f1aa0125e..97af213a446aec4cbdb20a85ecfb0ed5b8834eff 100644
--- a/chrome/browser/resources/history/history.js
+++ b/chrome/browser/resources/history/history.js
@@ -171,9 +171,10 @@ Visit.prototype.getResultDOM = function(propertyBag) {
     entryBox.setAttribute('for', checkbox.id);
     entryBox.addEventListener('mousedown', entryBoxMousedown);
     entryBox.addEventListener('click', entryBoxClick);
-    entryBox.addEventListener('keydown', this.handleKeydown_.bind(this));
   }
 
+  entryBox.addEventListener('keydown', this.handleKeydown_.bind(this));
+
   // Keep track of the drop down that triggered the menu, so we know
   // which element to apply the command to.
   // TODO(dubroy): Ideally we'd use 'activate', but MenuButton swallows it.