Move chrome/browser/manifest to content/browser.

content/public/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/ui.gni")
 
 # See //content/BUILD.gn for how this works.
 group("browser") {
   if (is_component_build) {
     public_deps = [
@@ skipping 122 matching lines @@
     "indexed_db_info.h",
     "interstitial_page.h",
     "interstitial_page_delegate.cc",
     "interstitial_page_delegate.h",
     "invalidate_type.h",
     "javascript_dialog_manager.cc",
     "javascript_dialog_manager.h",
     "keyboard_event_processing_result.h",
     "load_notification_details.h",
     "local_storage_usage_info.h",
+    "manifest_icon_downloader.h",
+    "manifest_icon_selector.h",
     "media_capture_devices.h",
     "media_device_id.cc",
     "media_device_id.h",
     "media_request_state.h",
     "media_session.h",
     "media_session_observer.cc",
     "media_session_observer.h",
     "memory_coordinator.h",
     "memory_coordinator_delegate.h",
     "message_port_provider.h",
@@ skipping 195 matching lines @@
     ]
   }
 
   if (is_chromeos) {
     sources += [
       "arc_tracing_agent.cc",
       "arc_tracing_agent.h",
     ]
   }
 }