Fix extraneous beeps on empty page search.

chrome/browser/ui/find_bar/find_bar_controller.h

Index: chrome/browser/ui/find_bar/find_bar_controller.h
diff --git a/chrome/browser/ui/find_bar/find_bar_controller.h b/chrome/browser/ui/find_bar/find_bar_controller.h
index 89d252aed9d2a0eb9b3807b84039da469f2cdfb5..25ecaed12f3ee6d8969e63d9710f57861b2a8085 100644
--- a/chrome/browser/ui/find_bar/find_bar_controller.h
+++ b/chrome/browser/ui/find_bar/find_bar_controller.h
@@ -99,6 +99,12 @@ class FindBarController : public content::NotificationObserver {
   // UpdateFindBarForCurrentResult to avoid flickering.
   int last_reported_matchcount_;
 
+  // Used to keep track of whether the user has been notified that the find came
+  // up empty. A single find session can result in multiple final updates, if
+  // the document contents change dynamically. It's a nuisance to notify the
+  // user more than once that a search came up empty, however.
+  base::string16 alerted_search_;
+
   DISALLOW_COPY_AND_ASSIGN(FindBarController);
 };