Merge InstantTag into InstantPage.

chrome/browser/ui/search/instant_tab.h

-// 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_UI_SEARCH_INSTANT_TAB_H_
-#define CHROME_BROWSER_UI_SEARCH_INSTANT_TAB_H_
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "chrome/browser/ui/search/instant_page.h"
-
-// InstantTab represents a committed page (i.e. an actual tab on the tab strip)
-// that supports the Instant API.
-class InstantTab : public InstantPage {
- public:
-  explicit InstantTab(InstantPage::Delegate* delegate);
-  ~InstantTab() override;
-
-  // Start observing |contents| for messages. Sends a message to determine if
-  // the page supports the Instant API.
-  void Init(content::WebContents* contents);
-
- private:
-  // Overridden from InstantPage:
-  bool ShouldProcessAboutToNavigateMainFrame() override;
-
-  DISALLOW_COPY_AND_ASSIGN(InstantTab);
-};
-
-#endif  // CHROME_BROWSER_UI_SEARCH_INSTANT_TAB_H_