Remove som GYP annotations, remove unused manifest.

content/shell/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/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//build/config/win/console_app.gni")
 import("//build/config/win/manifest.gni")
 import("//media/media_options.gni")
@@ skipping 467 matching lines @@
     ldflags = [
       # The main app is at Content Shell.app/Contents/MacOS/Content Shell
       # so set the rpath up to Contents/ so that the loader can find
       # Framworks/.
       "-rpath",
       "@executable_path/../",
     ]
     info_plist_target = ":content_shell_plist"
   }
 } else {
-  # TODO(brettw) when GYP is no longer necessary, delete
-  # content/shell/app/shell.exe.manifest. This file is not used in GN.
   executable("content_shell") {
     testonly = true
 
     # TODO(GYP) mac resource bundle stuff for this target.
     sources = [
       "app/shell_main.cc",
     ]
 
     if (is_win) {
       sources += [ "app/shell.rc" ]
@@ skipping 25 matching lines @@
     }
 
     if (is_linux && !is_component_build) {
       # Set rpath to find our own libfreetype even in a non-component build.
       configs += [ "//build/config/gcc:rpath_for_built_shared_libraries" ]
     }
   }
 }
 
 if (is_win) {
-  # GYP version: content/content_shell_and_tests.gyp:content_shell_crash_service
   executable("content_shell_crash_service") {
     sources = [
       "tools/content_shell_crash_service.cc",
     ]
 
     deps = [
       "//base",
       "//build/config/sanitizers:deps",
       "//build/win:default_exe_manifest",
       "//components/crash/content/tools:crash_service",
@@ skipping 196 matching lines @@
       "{{bundle_resources_dir}}/{{source_file_part}}",
     ]
   }
 }
 
 mojom("mojo_bindings") {
   sources = [
     "common/layout_test/layout_test_bluetooth_fake_adapter_setter.mojom",
   ]
 }