Remove DownloadProcessService code path

content/app/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/chrome_build.gni")
 import("//build/config/features.gni")
 
 # Implements "content_main" given the defines and visibility. On Windows this
 # is compiled with a different define for browser and child, but all code needs
 # to be shared.
@@ skipping 97 matching lines @@
 
     if (is_android) {
       sources += [
         "android/app_jni_registrar.cc",
         "android/app_jni_registrar.h",
         "android/child_process_service_impl.cc",
         "android/child_process_service_impl.h",
         "android/content_jni_onload.cc",
         "android/content_main.cc",
         "android/content_main.h",
-        "android/download_main.cc",
         "android/library_loader_hooks.cc",
         "android/library_loader_hooks.h",
       ]
     } else {
       sources += [ "content_main.cc" ]
     }
 
     configs += extra_configs
     deps = content_app_deps + [ ":$runner_target_name" ]
     forward_variables_from(invoker,
@@ skipping 31 matching lines @@
   implement_content_app("browser") {
     visibility = [ "//content/public/app:browser" ]
     defines = [ "CHROME_MULTIPLE_DLL_BROWSER" ]
   }
 
   implement_content_app("child") {
     visibility = [ "//content/public/app:child" ]
     defines = [ "CHROME_MULTIPLE_DLL_CHILD" ]
   }
 }