[DevTools] Extract part of DevTools into inspector app.

Source/devtools/front_end/toolbox_bootstrap/Toolbox.js

Index: Source/devtools/front_end/toolbox_bootstrap/Toolbox.js
diff --git a/Source/devtools/front_end/toolbox_bootstrap/Toolbox.js b/Source/devtools/front_end/toolbox_bootstrap/Toolbox.js
index ae010b4cef652e1d6a05bc64259b7e8b2909fabd..10d794fdb3a393d102c9310d721db306cf4a7261 100644
--- a/Source/devtools/front_end/toolbox_bootstrap/Toolbox.js
+++ b/Source/devtools/front_end/toolbox_bootstrap/Toolbox.js
@@ -20,25 +20,6 @@ function toolboxLoaded()
     window.opener.WebInspector["app"]["toolboxLoaded"](document);
 }
 
-/**
- * @suppressGlobalPropertiesCheck
- */
-function windowLoaded()
-{
-    window.removeEventListener("DOMContentLoaded", windowLoaded, false);
-    toolboxLoaded();
-}
-
-/**
- * @suppressGlobalPropertiesCheck
- */
-function initToolbox()
-{
-    if (document.readyState === "complete")
-        toolboxLoaded();
-    else
-        window.addEventListener("DOMContentLoaded", windowLoaded, false);
-}
-initToolbox();
+runOnWindowLoad(toolboxLoaded);
 
 })();