Remove InstantTab::Delegate::InstantSupportDetermined

chrome/browser/ui/search/instant_tab.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/ui/search/instant_tab.h"
 
-#include "chrome/browser/ui/search/search_model.h"
-#include "chrome/browser/ui/search/search_tab_helper.h"
-#include "chrome/common/url_constants.h"
 #include "content/public/browser/navigation_handle.h"
-#include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 
 InstantTab::Delegate::~Delegate() {}
 
 InstantTab::InstantTab(Delegate* delegate, content::WebContents* web_contents)
     : delegate_(delegate), pending_web_contents_(web_contents) {}
 
-InstantTab::~InstantTab() {
-  if (web_contents()) {
-    SearchTabHelper::FromWebContents(web_contents())->model()->RemoveObserver(
-        this);
-  }
-}
+InstantTab::~InstantTab() {}
 
 void InstantTab::Init() {
   if (!pending_web_contents_)
     return;
 
   Observe(pending_web_contents_);
   pending_web_contents_ = nullptr;
-
-  SearchModel* model =
-      SearchTabHelper::FromWebContents(web_contents())->model();
-  model->AddObserver(this);
-
-  // Already know whether the page supports instant.
-  if (model->instant_support() != INSTANT_SUPPORT_UNKNOWN)
-    InstantSupportDetermined(model->instant_support() == INSTANT_SUPPORT_YES);
 }
 
 void InstantTab::DidFinishNavigation(
     content::NavigationHandle* navigation_handle) {
   if (navigation_handle->HasCommitted() && navigation_handle->IsInMainFrame()) {
     delegate_->InstantTabAboutToNavigateMainFrame(
         web_contents(), navigation_handle->GetURL());
   }
 }
-
-void InstantTab::ModelChanged(const SearchModel::State& old_state,
-                              const SearchModel::State& new_state) {
-  if (old_state.instant_support != new_state.instant_support)
-    InstantSupportDetermined(new_state.instant_support == INSTANT_SUPPORT_YES);
-}
-
-void InstantTab::InstantSupportDetermined(bool supports_instant) {
-  delegate_->InstantSupportDetermined(web_contents(), supports_instant);
-
-  // If the page doesn't support Instant, stop listening to it.
-  if (!supports_instant) {
-    if (web_contents()) {
-      SearchTabHelper::FromWebContents(web_contents())->model()->RemoveObserver(
-          this);
-    }
-
-    Observe(nullptr);
-  }
-}