Fixes bug in instant where we would end up incorrectly using the

chrome/browser/ui/gtk/browser_window_gtk.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_GTK_BROWSER_WINDOW_GTK_H_
 #define CHROME_BROWSER_UI_GTK_BROWSER_WINDOW_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
@@ skipping 123 matching lines @@
                                       bool* is_keyboard_shortcut);
   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event);
   virtual void ShowCreateWebAppShortcutsDialog(
       TabContentsWrapper* tab_contents);
   virtual void ShowCreateChromeAppShortcutsDialog(Profile* profile,
                                                   const Extension* app);
   virtual void Cut();
   virtual void Copy();
   virtual void Paste();
   virtual void ShowInstant(TabContentsWrapper* preview);
-  virtual void HideInstant(bool instant_is_active);
+  virtual void HideInstant();
   virtual gfx::Rect GetInstantBounds();
   virtual WindowOpenDisposition GetDispositionForPopupBounds(
       const gfx::Rect& bounds);
   virtual FindBar* CreateFindBar() OVERRIDE;
   virtual void ShowAvatarBubble(TabContents* tab_contents,
                                 const gfx::Rect& rect) OVERRIDE;
 
   // Overridden from NotificationObserver:
   virtual void Observe(int type,
                        const NotificationSource& source,
@@ skipping 362 matching lines @@
   // be called. This should only be enabled in tests where the debounce timeout
   // introduces timing issues (e.g. in OmniBoxApiTest it dismisses the
   // autocomplete popup before the results can be read) and the final window
   // position is unimportant.
   bool debounce_timer_disabled_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserWindowGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_BROWSER_WINDOW_GTK_H_