Address more TODO(GYP) in the GN build.

chrome/installer/mini_installer/BUILD.gn

 # Copyright 2015 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("//build_overrides/v8.gni")
 import("//chrome/version.gni")
 import("//third_party/icu/config.gni")
 import("//ui/base/ui_features.gni")
@@ skipping 148 matching lines @@
     deps += [ "//v8" ]
   }
 
   depfile = "$target_gen_dir/archive.d"
   args += [
     "--depfile",
     rebase_path(depfile, root_build_dir),
   ]
 }
 
-# TODO(GYP) bug 521052: This target needs to be checked to make sure its the
-# same size as the GYP build.
 executable("mini_installer") {
   sources = [
     "mini_installer.cc",
     packed_files_rc_file,
   ]
 
   # This target is special so we manually override most linker flags and
   # specify our own to keep the size down.
   configs -= [
     "//build/config:executable_config",
@@ skipping 40 matching lines @@
     args = [
       "--out",
       "$target_name.exe",
     ]
     deps = [
       ":mini_installer",
       "//chrome/installer/test:alternate_version_generator",
     ]
   }
 }