Instant: Use only one hidden WebContents per profile.

chrome/browser/instant/instant_preview_controller.h

Index: chrome/browser/instant/instant_preview_controller.h
diff --git a/chrome/browser/instant/instant_preview_controller.h b/chrome/browser/instant/instant_preview_controller.h
deleted file mode 100644
index e90e2b612d5e2d6af3da1edef6c3d92d5d5f49c5..0000000000000000000000000000000000000000
--- a/chrome/browser/instant/instant_preview_controller.h
+++ /dev/null
@@ -1,27 +0,0 @@
-// Copyright 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_INSTANT_INSTANT_PREVIEW_CONTROLLER_H_
-#define CHROME_BROWSER_INSTANT_INSTANT_PREVIEW_CONTROLLER_H_
-
-#include "base/compiler_specific.h"
-#include "chrome/browser/instant/instant_model_observer.h"
-
-class Browser;
-class InstantModel;
-
-// Abstract base class for platform-specific Instant preview controllers.
-class InstantPreviewController : public InstantModelObserver {
- protected:
-  explicit InstantPreviewController(Browser* browser);
-  virtual ~InstantPreviewController();
-
-  Browser* const browser_;
-
- private:
-  // Overridden from InstantModelObserver:
-  virtual void PreviewStateChanged(const InstantModel& model) OVERRIDE = 0;
-};
-
-#endif  // CHROME_BROWSER_INSTANT_INSTANT_PREVIEW_CONTROLLER_H_