Force recalc of the keyloop for alerts.

chrome/browser/ui/cocoa/javascript_app_modal_dialog_cocoa.mm

Index: chrome/browser/ui/cocoa/javascript_app_modal_dialog_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/javascript_app_modal_dialog_cocoa.mm b/chrome/browser/ui/cocoa/javascript_app_modal_dialog_cocoa.mm
index b9aff4f1632ecb39e0744740aa6ad6f01120645a..6d4ebdc9e17789e0e29cd2f4e57f2878f6001d21 100644
--- a/chrome/browser/ui/cocoa/javascript_app_modal_dialog_cocoa.mm
+++ b/chrome/browser/ui/cocoa/javascript_app_modal_dialog_cocoa.mm
@@ -140,6 +140,10 @@ const int kMessageTextMaxSlots = 2000;
   DCHECK(!alertShown_);
   alertShown_ = YES;
   NSAlert* alert = [self alert];
+
+  [alert layout];
+  [[alert window] recalculateKeyViewLoop];
+
   [alert beginSheetModalForWindow:nil  // nil here makes it app-modal
                     modalDelegate:self
                    didEndSelector:@selector(alertDidEnd:returnCode:contextInfo:)