Bug 789031 - Remove unnecessary tabPreviews.uninit. r=ttaubert

browser/base/content/browser-tabPreviews.js

@@ -27,18 +27,10 @@ var tabPreviews = {
       return;
     this._selectedTab = gBrowser.selectedTab;
 
-    window.addEventListener("unload", this, false);
     gBrowser.tabContainer.addEventListener("TabSelect", this, false);
     gBrowser.tabContainer.addEventListener("SSTabRestored", this, false);
   },
 
-  uninit: function tabPreviews_uninit() {
-    window.removeEventListener("unload", this, false);
-    gBrowser.tabContainer.removeEventListener("TabSelect", this, false);
-    gBrowser.tabContainer.removeEventListener("SSTabRestored", this, false);
-    this._selectedTab = null;
-  },
-
   get: function tabPreviews_get(aTab) {
     let uri = aTab.linkedBrowser.currentURI.spec;
 
@@ -103,9 +95,6 @@ var tabPreviews = {
       case "SSTabRestored":
         this.capture(event.target, true);
         break;
-      case "unload":
-        this.uninit();
-        break;
     }
   }
 };