Instant: Use only one hidden WebContents per profile.

chrome/browser/ui/browser.h

 // Copyright (c) 2012 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_BROWSER_H_
 #define CHROME_BROWSER_UI_BROWSER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 438 matching lines @@
 
   // True when the mouse cursor is locked.
   bool IsMouseLocked() const;
 
   // Called each time the browser window is shown.
   void OnWindowDidShow();
 
   // Show the first run search engine bubble on the location bar.
   void ShowFirstRunBubble();
 
-  // If necessary, update the bookmark bar state according to the instant
-  // preview state: when instant preview shows suggestions and bookmark bar is
+  // If necessary, update the bookmark bar state according to the Instant
+  // overlay state: when Instant overlay shows suggestions and bookmark bar is
   // still showing attached, hide it.
-  void MaybeUpdateBookmarkBarStateForInstantPreview(
-      const chrome::search::Mode& mode);
+  void MaybeUpdateBookmarkBarStateForInstantOverlay();
 
   FullscreenController* fullscreen_controller() const {
     return fullscreen_controller_.get();
   }
 
   extensions::WindowController* extension_window_controller() const {
     return extension_window_controller_.get();
   }
 
  private:
@@ skipping 449 matching lines @@
   bool window_has_shown_;
 
   // Currently open color chooser. Non-NULL after OpenColorChooser is called and
   // before DidEndColorChooser is called.
   scoped_ptr<content::ColorChooser> color_chooser_;
 
   DISALLOW_COPY_AND_ASSIGN(Browser);
 };
 
 #endif  // CHROME_BROWSER_UI_BROWSER_H_