Do not fire multiple password reuse events for the same page.

components/password_manager/core/browser/password_reuse_detection_manager.h

Index: components/password_manager/core/browser/password_reuse_detection_manager.h
diff --git a/components/password_manager/core/browser/password_reuse_detection_manager.h b/components/password_manager/core/browser/password_reuse_detection_manager.h
index f6e1fd4f3314fe1cfb4bfa08be10c972e3b60844..bad3370f7628dc502b48ac5f18baa552c7f4e572 100644
--- a/components/password_manager/core/browser/password_reuse_detection_manager.h
+++ b/components/password_manager/core/browser/password_reuse_detection_manager.h
@@ -44,6 +44,7 @@ class PasswordReuseDetectionManager : public PasswordReuseDetectorConsumer {
   base::Time last_keystroke_time_;
   // Used to retrieve the current time, in base::Time units.
   std::unique_ptr<base::Clock> clock_;
+  bool reuse_on_this_page_was_found_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordReuseDetectionManager);
 };