Fix a find_bar audible alert regression due to r404307.

chrome/browser/ui/find_bar/find_bar_controller.cc

Index: chrome/browser/ui/find_bar/find_bar_controller.cc
diff --git a/chrome/browser/ui/find_bar/find_bar_controller.cc b/chrome/browser/ui/find_bar/find_bar_controller.cc
index df1001e1d2266c460a3e09e0927bd158dd05e739..db9cfcefd123182f20140dccf9165747410969e3 100644
--- a/chrome/browser/ui/find_bar/find_bar_controller.cc
+++ b/chrome/browser/ui/find_bar/find_bar_controller.cc
@@ -144,8 +144,8 @@ void FindBarController::Observe(int type,
         const base::string16& last_search =
             find_tab_helper->previous_find_text();
         const base::string16& current_search = find_tab_helper->find_text();
-        if (base::StartsWith(last_search, current_search,
-                             base::CompareCase::SENSITIVE)) {
+        if (!base::StartsWith(last_search, current_search,
+                              base::CompareCase::SENSITIVE)) {
           find_bar_->AudibleAlert();
         }
       }