Revert of Shrink gn's chrome.dll - now smaller than gyp's

gpu/ipc/service/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("//testing/test.gni")
 import("//build/config/ui.gni")
 if (is_mac) {
   import("//build/config/mac/mac_sdk.gni")
 }
 
 group("service") {
   if (is_component_build) {
     public_deps = [
       "//gpu",
     ]
   } else {
     public_deps = [
       ":ipc_service_sources",
     ]
   }
 }
 
-if (is_component_build) {
-  link_target_type = "source_set"
-} else {
-  link_target_type = "static_library"
-}
-target(link_target_type, "ipc_service_sources") {
+source_set("ipc_service_sources") {
   visibility = [ "//gpu/*" ]
   sources = [
     "gpu_channel.cc",
     "gpu_channel.h",
     "gpu_channel_manager.cc",
     "gpu_channel_manager.h",
     "gpu_channel_manager_delegate.h",
     "gpu_command_buffer_stub.cc",
     "gpu_command_buffer_stub.h",
     "gpu_config.h",
@@ skipping 125 matching lines @@
     deps += [ "//ui/android:ui_java" ]
   }
   if (is_mac) {
     sources += [ "gpu_memory_buffer_factory_io_surface_unittest.cc" ]
   }
   if (use_ozone) {
     sources += [ "gpu_memory_buffer_factory_ozone_native_pixmap_unittest.cc" ]
     deps += [ "//ui/ozone" ]
   }
 }