Browser: Avoid ninja-import of global variable

Author: https://github.com/BenWiederhake
Commit: 84e112be6b
Pull-request: https://github.com/SerenityOS/serenity/pull/3096
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/stelar7

Applications/Browser/Tab.cpp

@@ -26,6 +26,7 @@
 
 #include "Tab.h"
 #include "BookmarksBarWidget.h"
+#include "Browser.h"
 #include "ConsoleWidget.h"
 #include "DownloadWidget.h"
 #include "InspectorWidget.h"
@@ -60,8 +61,6 @@
 
 namespace Browser {
 
-extern String g_home_url;
-
 URL url_from_user_input(const String& input)
 {
     auto url = URL(input);