Revert of [ios] Switches ToolbarModelDelegateIOS to use WebStateList.

ios/chrome/browser/ui/toolbar/toolbar_model_impl_ios.mm

 // 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.
 
 #include "ios/chrome/browser/ui/toolbar/toolbar_model_impl_ios.h"
 
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/toolbar/toolbar_model_impl.h"
 #include "ios/chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
-#import "ios/chrome/browser/tabs/legacy_tab_helper.h"
-#include "ios/chrome/browser/tabs/tab.h"
+#import "ios/chrome/browser/tabs/tab.h"
 #include "ios/chrome/browser/ui/toolbar/toolbar_model_delegate_ios.h"
 #import "ios/web/public/web_state/web_state.h"
 
 namespace {
 const size_t kMaxURLDisplayChars = 32 * 1024;
 
-bookmarks::BookmarkModel* GetBookmarkModelForWebState(
-    web::WebState* web_state) {
+bookmarks::BookmarkModel* GetBookmarkModelForTab(Tab* tab) {
+  web::WebState* web_state = [tab webState];
   if (!web_state)
     return nullptr;
   web::BrowserState* browser_state = web_state->GetBrowserState();
   if (!browser_state)
     return nullptr;
   return ios::BookmarkModelFactory::GetForBrowserState(
       ios::ChromeBrowserState::FromBrowserState(browser_state));
 }
 }  // namespace
 
 ToolbarModelImplIOS::ToolbarModelImplIOS(ToolbarModelDelegateIOS* delegate) {
   delegate_ = delegate;
   toolbar_model_.reset(new ToolbarModelImpl(delegate, kMaxURLDisplayChars));
 }
 
 ToolbarModelImplIOS::~ToolbarModelImplIOS() {}
 
 ToolbarModel* ToolbarModelImplIOS::GetToolbarModel() {
   return toolbar_model_.get();
 }
 
 bool ToolbarModelImplIOS::IsLoading() {
   // Please note, ToolbarModel's notion of isLoading is slightly different from
   // WebState's IsLoading().
-  web::WebState* web_state = delegate_->GetActiveWebState();
+  web::WebState* web_state = delegate_->GetCurrentTab().webState;
   return web_state && web_state->IsLoading() && !IsCurrentTabNativePage();
 }
 
 CGFloat ToolbarModelImplIOS::GetLoadProgressFraction() {
-  web::WebState* webState = delegate_->GetActiveWebState();
+  web::WebState* webState = delegate_->GetCurrentTab().webState;
   return webState ? webState->GetLoadingProgress() : 0.0;
 }
 
 bool ToolbarModelImplIOS::CanGoBack() {
-  if (!delegate_)
-    return false;
-  web::WebState* web_state = delegate_->GetActiveWebState();
-  return web_state && web_state->GetNavigationManager()->CanGoBack();
+  return delegate_->GetCurrentTab().canGoBack;
 }
 
 bool ToolbarModelImplIOS::CanGoForward() {
-  if (!delegate_)
-    return false;
-  web::WebState* web_state = delegate_->GetActiveWebState();
-  return web_state && web_state->GetNavigationManager()->CanGoForward();
+  return delegate_->GetCurrentTab().canGoForward;
 }
 
 bool ToolbarModelImplIOS::IsCurrentTabNativePage() {
-  web::WebState* web_state = delegate_->GetActiveWebState();
-  return web_state &&
-         web_state->GetLastCommittedURL().SchemeIs(kChromeUIScheme);
+  Tab* current_tab = delegate_->GetCurrentTab();
+  return current_tab && current_tab.url.SchemeIs(kChromeUIScheme);
 }
 
 bool ToolbarModelImplIOS::IsCurrentTabBookmarked() {
-  web::WebState* web_state = delegate_->GetActiveWebState();
-  bookmarks::BookmarkModel* bookmarkModel =
-      GetBookmarkModelForWebState(web_state);
-  return web_state && bookmarkModel &&
-         bookmarkModel->IsBookmarked(web_state->GetLastCommittedURL());
+  Tab* current_tab = delegate_->GetCurrentTab();
+  bookmarks::BookmarkModel* bookmarkModel = GetBookmarkModelForTab(current_tab);
+  return current_tab && bookmarkModel &&
+         bookmarkModel->IsBookmarked(current_tab.url);
 }
 
 bool ToolbarModelImplIOS::IsCurrentTabBookmarkedByUser() {
-  web::WebState* web_state = delegate_->GetActiveWebState();
-  bookmarks::BookmarkModel* bookmarkModel =
-      GetBookmarkModelForWebState(web_state);
-  return web_state && bookmarkModel &&
-         bookmarkModel->GetMostRecentlyAddedUserNodeForURL(
-             web_state->GetLastCommittedURL());
+  Tab* current_tab = delegate_->GetCurrentTab();
+  bookmarks::BookmarkModel* bookmarkModel = GetBookmarkModelForTab(current_tab);
+  return current_tab && bookmarkModel &&
+         bookmarkModel->GetMostRecentlyAddedUserNodeForURL(current_tab.url);
 }
 
 bool ToolbarModelImplIOS::ShouldDisplayHintText() {
-  web::WebState* web_state = delegate_->GetActiveWebState();
-  Tab* tab = LegacyTabHelper::GetTabForWebState(web_state);
-  return tab && [tab.webController wantsLocationBarHintText];
+  Tab* current_tab = delegate_->GetCurrentTab();
+  return [current_tab.webController wantsLocationBarHintText];
 }
+