Remove unused content .rc files.

content/content_tests.gypi

 # Copyright (c) 2013 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.
 
 {
   'variables': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 1432 matching lines @@
             'HAS_OUT_OF_PROC_TEST_RUNNER',
           ],
           'sources': [ '<@(content_browsertests_sources)' ],
           'conditions': [
             ['OS=="win"', {
               'resource_include_dirs': [
                 '<(SHARED_INTERMEDIATE_DIR)/webkit',
               ],
               'sources': [
                 '<@(content_browsertests_win_sources)',
-                # TODO: It would be nice to have these pulled in automatically
-                # from direct_dependent_settings in their various targets but
-                # that causes errors in other targets when resulting .res files
-                # get referenced multiple times.
-                '<(SHARED_INTERMEDIATE_DIR)/content/app/strings/content_strings_en-US.rc',
                 'shell/app/resource.h',
                 'shell/app/shell.rc',
               ],
               'dependencies': [
                 '<(DEPTH)/content/app/strings/content_strings.gyp:content_strings',
                 '<(DEPTH)/net/net.gyp:net_resources',
                 '<(DEPTH)/third_party/WebKit/public/blink_resources.gyp:blink_resources',
                 '<(DEPTH)/third_party/iaccessible2/iaccessible2.gyp:iaccessible2',
                 '<(DEPTH)/third_party/isimpledom/isimpledom.gyp:isimpledom',
               ],
@@ skipping 638 matching lines @@
             ],
           },
           'includes': [
             '../build/host_jar.gypi',
           ],
         },
       ],
     }],
   ],
 }