user_manager: Remove deps on session_manager

components/user_manager/BUILD.gn

 # 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.
 
 component("user_manager") {
   sources = [
     "empty_user_info.cc",
     "empty_user_info.h",
     "user_info.cc",
     "user_info.h",
@@ skipping 21 matching lines @@
       "user_image/user_image.cc",
       "user_image/user_image.h",
       "user_manager.cc",
       "user_manager.h",
       "user_manager_base.cc",
       "user_manager_base.h",
       "user_type.h",
     ]
     deps += [
       "//components/prefs",
-      "//components/session_manager/core",
       "//google_apis",
       "//url",
     ]
   }
 }
 
 if (is_chromeos) {
   source_set("test_support") {
     testonly = true
     sources = [
@@ skipping 17 matching lines @@
     ]
     deps = [
       ":user_manager",
       "//components/signin/core/account_id",
       "//skia",
       "//testing/gtest",
       "//ui/gfx",
     ]
   }
 }