Cleanup: remove dead code from InstantPage and InstantController

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"
 
-class Profile;
-
 // InstantTab represents a committed page (i.e. an actual tab on the tab strip)
 // that supports the Instant API.
 class InstantTab : public InstantPage {
  public:
-  InstantTab(InstantPage::Delegate* delegate, Profile* profile);
+  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);
 
   // Logs statistics regarding the NTP.
   static void TabDeactivated(content::WebContents* contents);
   static void MostVisitedItemsChanged(content::WebContents* contents);
 
  private:
   // Overridden from InstantPage:
   bool ShouldProcessAboutToNavigateMainFrame() override;
 
   DISALLOW_COPY_AND_ASSIGN(InstantTab);
 };
 
 #endif  // CHROME_BROWSER_UI_SEARCH_INSTANT_TAB_H_