Remove ChromeBrowserProvider::GetLiveTabContextProvider() method.

ios/chrome/browser/sessions/tab_restore_service_delegate_provider_impl.mm

-// Copyright 2014 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/sessions/tab_restore_service_delegate_provider_impl.h"
-
-#include "components/sessions/core/live_tab_context.h"
-#include "components/sessions/ios/ios_live_tab.h"
-#include "ios/chrome/browser/browser_state/chrome_browser_state.h"
-#include "ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios.h"
-#include "ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios_factory.h"
-#include "ios/chrome/browser/tabs/tab.h"
-#include "ios/chrome/browser/tabs/tab_model.h"
-#include "ios/chrome/browser/ui/browser_ios.h"
-#include "ios/chrome/browser/ui/browser_list_ios.h"
-#import "ios/web/public/web_state/web_state.h"
-
-namespace ios_internal {
-
-TabRestoreServiceDelegateProviderImpl::TabRestoreServiceDelegateProviderImpl() {
-}
-
-TabRestoreServiceDelegateProviderImpl::
-    ~TabRestoreServiceDelegateProviderImpl() {}
-
-sessions::LiveTabContext* TabRestoreServiceDelegateProviderImpl::Create(
-    ios::ChromeBrowserState* browser_state) {
-  return TabRestoreServiceDelegateImplIOSFactory::GetForBrowserState(
-      browser_state);
-}
-
-sessions::LiveTabContext*
-TabRestoreServiceDelegateProviderImpl::FindContextWithID(int32_t desired_id) {
-  for (BrowserListIOS::const_iterator iter = BrowserListIOS::begin();
-       iter != BrowserListIOS::end(); ++iter) {
-    id<BrowserIOS> browser = *iter;
-    if ([browser tabModel].sessionID.id() == desired_id) {
-      return TabRestoreServiceDelegateImplIOSFactory::GetForBrowserState(
-          [browser browserState]);
-    }
-  }
-  return NULL;
-}
-
-sessions::LiveTabContext*
-TabRestoreServiceDelegateProviderImpl::FindContextForTab(
-    const sessions::LiveTab* tab) {
-  const sessions::IOSLiveTab* requested_tab =
-      static_cast<const sessions::IOSLiveTab*>(tab);
-  for (BrowserListIOS::const_iterator iter = BrowserListIOS::begin();
-       iter != BrowserListIOS::end(); ++iter) {
-    id<BrowserIOS> browser = *iter;
-    for (Tab* current_tab in [browser tabModel]) {
-      if (current_tab.webState &&
-          current_tab.webState == requested_tab->web_state()) {
-        return TabRestoreServiceDelegateImplIOSFactory::GetForBrowserState(
-            [browser browserState]);
-      }
-    }
-  }
-  return NULL;
-}
-
-}  // namespace ios_internal