Refactor overall test suite, use replaceApp in HistoryListTest

chrome/browser/resources/md_history/app.js

Index: chrome/browser/resources/md_history/app.js
diff --git a/chrome/browser/resources/md_history/app.js b/chrome/browser/resources/md_history/app.js
index c0dbb18a500611cfc0f8a7e112cfe6348a483d02..0b287d535ae590723fb2e1f9422bfe80010d7e95 100644
--- a/chrome/browser/resources/md_history/app.js
+++ b/chrome/browser/resources/md_history/app.js
@@ -107,13 +107,28 @@ Polymer({
     'unselect-all': 'unselectAll',
   },
 
+  /** @private {?function(!Event)} */
+  boundOnCanExecute_: null,
+
+  /** @private {?function(!Event)} */
+  boundOnCommand_: null,
+
   /** @override */
-  ready: function() {
+  attached: function() {
     this.grouped_ = loadTimeData.getBoolean('groupByDomain');
 
     cr.ui.decorate('command', cr.ui.Command);
-    document.addEventListener('canExecute', this.onCanExecute_.bind(this));
-    document.addEventListener('command', this.onCommand_.bind(this));
+    this.boundOnCanExecute_ = this.onCanExecute_.bind(this);
+    this.boundOnCommand_ = this.onCommand_.bind(this);
+
+    document.addEventListener('canExecute', this.boundOnCanExecute_);
+    document.addEventListener('command', this.boundOnCommand_);
+  },
+
+  /** @override */
+  detached: function() {
+    document.removeEventListener('canExecute', this.boundOnCanExecute_);
+    document.removeEventListener('command', this.boundOnCommand_);
   },
 
   onFirstRender: function() {