Fix spurious visibility events when committing Instant.

chrome/browser/ui/cocoa/browser_window_controller.mm

Index: chrome/browser/ui/cocoa/browser_window_controller.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller.mm b/chrome/browser/ui/cocoa/browser_window_controller.mm
index 5bf5d07407aace99a8e9ce0e97008f686b7457f3..d63418a1cf8419381a32134b859c6d6cd0b861ed 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller.mm
@@ -1557,9 +1557,7 @@ enum {
 }
 
 - (void)onReplaceTabWithContents:(WebContents*)contents {
-  // Simply remove the preview view if it exists; the tab strip
-  // controller will reinstall the view as the active view.
-  [previewableContentsController_ hidePreview];
+  [previewableContentsController_ onActivateTabWithContents:contents];
   [self updateBookmarkBarVisibilityWithAnimation:NO];
 }
 
@@ -1585,7 +1583,7 @@ enum {
 }
 
 - (void)onInsertTabWithContents:(WebContents*)contents {
-  [previewableContentsController_ onInsertTabWithContents:contents];
+  [previewableContentsController_ onActivateTabWithContents:contents];
 }
 
 - (void)userChangedTheme {