Update a few JumpList comments

chrome/browser/win/jumplist.h

Index: chrome/browser/win/jumplist.h
diff --git a/chrome/browser/win/jumplist.h b/chrome/browser/win/jumplist.h
index 975320ef416ee6fc56a8689f49952af6a382a82d..f41ce88aa9d7a444946105bac8638a6372747aad 100644
--- a/chrome/browser/win/jumplist.h
+++ b/chrome/browser/win/jumplist.h
@@ -119,7 +119,6 @@ class JumpList : public sessions::TabRestoreServiceObserver,
   void ShutdownOnUIThread() override;
 
   // Returns true if the custom JumpList is enabled.
-  // The custom jumplist works only on Windows 7 and above.
   static bool Enabled();
 
  private:
@@ -127,9 +126,6 @@ class JumpList : public sessions::TabRestoreServiceObserver,
   explicit JumpList(Profile* profile);  // Use JumpListFactory instead
   ~JumpList() override;
 
-  // The AddTab and AddWindow functions are copied from the
-  // RecentlyClosedTabsHandler class for compatibility with the new-tab page.
-
   // Adds a new ShellLinkItem for |tab| to |data| provided that doing so will
   // not exceed |max_items|.
   bool AddTab(const sessions::TabRestoreService::Tab& tab,