browser: Move FindBrowserWithWebContents() into chrome namespace.

chrome/browser/managed_mode/managed_mode_navigation_observer.cc

Index: chrome/browser/managed_mode/managed_mode_navigation_observer.cc
diff --git a/chrome/browser/managed_mode/managed_mode_navigation_observer.cc b/chrome/browser/managed_mode/managed_mode_navigation_observer.cc
index 868f332d42d748d89d13b04c6620f79891aa26b1..a2076d558807279523410be717981500b665e147 100644
--- a/chrome/browser/managed_mode/managed_mode_navigation_observer.cc
+++ b/chrome/browser/managed_mode/managed_mode_navigation_observer.cc
@@ -57,7 +57,7 @@ void GoBackToSafety(content::WebContents* web_contents) {
   // If this is the last tab, open a new window.
   if (BrowserList::size() == 1) {
     Browser* browser = *(BrowserList::begin());
-    DCHECK(browser == browser::FindBrowserWithWebContents(web_contents));
+    DCHECK(browser == chrome::FindBrowserWithWebContents(web_contents));
     if (browser->tab_count() == 1)
       chrome::NewEmptyWindow(browser->profile());
   }