Remove ChromeBrowserProvider::GetLiveTabContextProvider() method.

ios/chrome/browser/ui/BUILD.gn

 # Copyright 2016 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.
 
 import("//build/config/ios/rules.gni")
 
 source_set("ui_arc") {
   sources = [
     "network_activity_indicator_manager.h",
     "network_activity_indicator_manager.mm",
@@ skipping 266 matching lines @@
     "//ios/chrome/browser/infobars",
     "//ios/chrome/browser/metrics:metrics_internal",
     "//ios/chrome/browser/native_app_launcher:native_app_launcher_internal",
     "//ios/chrome/browser/net",
     "//ios/chrome/browser/passwords",
     "//ios/chrome/browser/payments",
     "//ios/chrome/browser/prefs",
     "//ios/chrome/browser/reading_list",
     "//ios/chrome/browser/search_engines",
     "//ios/chrome/browser/sessions",
-    "//ios/chrome/browser/sessions:sessions_internal",
     "//ios/chrome/browser/snapshots",
     "//ios/chrome/browser/snapshots:snapshots_internal",
     "//ios/chrome/browser/tabs",
     "//ios/chrome/browser/ui",
     "//ios/chrome/browser/ui:resources",
     "//ios/chrome/browser/ui/activity_services",
     "//ios/chrome/browser/ui/alert_coordinator",
     "//ios/chrome/browser/ui/authentication",
     "//ios/chrome/browser/ui/bookmarks",
     "//ios/chrome/browser/ui/colors",
@@ skipping 161 matching lines @@
 }
 
 # Clean skeleton targets
 source_set("ui_clean_skeleton") {
   sources = [
     "ui_types.h",
   ]
 
   configs += [ "//build/config/compiler:enable_arc" ]
 }