Move chrome/browser/manifest to content/browser.

content/browser/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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//gpu/vulkan/features.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
@@ skipping 922 matching lines @@
     "loader/upload_progress_tracker.h",
     "loader/url_loader_factory_impl.cc",
     "loader/url_loader_factory_impl.h",
     "loader/url_loader_request_handler.h",
     "loader/wake_lock_resource_throttle.cc",
     "loader/wake_lock_resource_throttle.h",
     "loader_delegate_impl.cc",
     "loader_delegate_impl.h",
     "mach_broker_mac.h",
     "mach_broker_mac.mm",
+    "manifest/manifest_icon_downloader.cc",
+    "manifest/manifest_icon_selector.cc",
     "manifest/manifest_manager_host.cc",
     "manifest/manifest_manager_host.h",
     "media/android/browser_media_player_manager.cc",
     "media/android/browser_media_player_manager.h",
     "media/android/browser_surface_view_manager.cc",
     "media/android/browser_surface_view_manager.h",
     "media/android/media_player_renderer.cc",
     "media/android/media_player_renderer.h",
     "media/android/media_resource_getter_impl.cc",
     "media/android/media_resource_getter_impl.h",
@@ skipping 1196 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }