Move WaitForLoadStop from ui_test_utils to browser_test_utils so that it can be reused in content_b…

chrome/test/base/ui_test_utils.h

Index: chrome/test/base/ui_test_utils.h
===================================================================
--- chrome/test/base/ui_test_utils.h	(revision 148448)
+++ chrome/test/base/ui_test_utils.h	(working copy)
@@ -103,10 +103,6 @@
 // race hazard. Use WindowedNotificationObserver instead.
 void WaitForNewTab(Browser* browser);
 
-// Waits for a load stop for the specified |tab|'s controller, if the tab is
-// currently loading.  Otherwise returns immediately.
-void WaitForLoadStop(content::WebContents* tab);
-
 // Opens |url| in an incognito browser window with the incognito profile of
 // |profile|, blocking until the navigation finishes. This will create a new
 // browser if a browser with the incognito profile does not exist. Returns the