Remove unused content .rc files.

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/ui.gni")
 import("//build/config/win/manifest.gni")
 import("//tools/grit/repack.gni")
 import("//tools/grit/grit_rule.gni")
 if (is_android) {
@@ skipping 313 matching lines @@
     ]
   }
 }
 
 grit("content_shell_resources_grit") {
   visibility = [ ":*" ]
   source = "shell_resources.grd"
   outputs = [
     "grit/shell_resources.h",
     "shell_resources.pak",
-    "shell_resources.rc",
   ]
 }
 
 copy("copy_shell_resources") {
   sources = [
     "$target_gen_dir/shell_resources.pak",
   ]
   outputs = [
     "$root_out_dir/shell_resources.pak",
   ]
@@ skipping 113 matching lines @@
 
     deps = [
       "//base",
       "//components/crash/tools:crash_service",
     ]
 
     configs -= [ "//build/config/win:console" ]
     configs += [ "//build/config/win:windowed" ]
   }
 }