Mac: Remove the workaround to prevent "Share" dialogs disappearing the browser.

chrome/browser/ui/cocoa/info_bubble_window.mm

Index: chrome/browser/ui/cocoa/info_bubble_window.mm
diff --git a/chrome/browser/ui/cocoa/info_bubble_window.mm b/chrome/browser/ui/cocoa/info_bubble_window.mm
index 1fa224717c872c73982a7db2a3e65100eedb2691..afeec6133fc210313a250d0e218666df98a6e2ce 100644
--- a/chrome/browser/ui/cocoa/info_bubble_window.mm
+++ b/chrome/browser/ui/cocoa/info_bubble_window.mm
@@ -247,12 +247,4 @@ class AppNotificationBridge : public content::NotificationObserver {
   return closing_;
 }
 
-// Override -[NSWindow addChildWindow] to prevent ShareKit bugs propagating
-// to the browser window. See http://crbug.com/475855.
-- (void)addChildWindow:(NSWindow*)childWindow
-               ordered:(NSWindowOrderingMode)orderingMode {
-  [[self parentWindow] removeChildWindow:self];
-  [super addChildWindow:childWindow ordered:orderingMode];
-}
-
 @end