mac: Fix a history swiper bug with magic mouse.

chrome/browser/renderer_host/chrome_render_widget_host_view_mac_history_swiper.mm

Index: chrome/browser/renderer_host/chrome_render_widget_host_view_mac_history_swiper.mm
diff --git a/chrome/browser/renderer_host/chrome_render_widget_host_view_mac_history_swiper.mm b/chrome/browser/renderer_host/chrome_render_widget_host_view_mac_history_swiper.mm
index f37cc6f74fc9fd5c02e3ba72cdcad566fe08dfd4..9729a1db1106999e561e1bdd12b6b8e8717138f1 100644
--- a/chrome/browser/renderer_host/chrome_render_widget_host_view_mac_history_swiper.mm
+++ b/chrome/browser/renderer_host/chrome_render_widget_host_view_mac_history_swiper.mm
@@ -379,8 +379,6 @@ static BOOL forceMagicMouse = NO;
         progress = MAX(0.0, progress);
         progress = MIN(1.0, progress);
         [historyOverlay setProgress:progress finished:finished];
-        if (ended)
-          [historyOverlay dismiss];
 
         // |gestureAmount| obeys -[NSEvent isDirectionInvertedFromDevice]
         // automatically.
@@ -393,8 +391,10 @@ static BOOL forceMagicMouse = NO;
             chrome::GoBack(browser, CURRENT_TAB);
         }
 
-        if (isComplete)
+        if (isComplete) {
+          [historyOverlay dismiss];
           [historyOverlay release];
+        }
   }];
 }