Make mojo_system static and mojo_system_impl a component, never use both

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.
 
 {
   'targets': [
     {
       'target_name': 'layouttest_support_content',
       'type': 'static_library',
       'conditions': [
@@ skipping 942 matching lines @@
                 'content.gyp:content_browser',
               ],
             }],
           ],
         },
         {
           'target_name': 'web_ui_test_mojo_bindings',
           'type': 'static_library',
           'dependencies': [
             '../mojo/mojo.gyp:mojo_bindings',
-            '../mojo/mojo.gyp:mojo_system',
           ],
           'sources': [
             'test/data/web_ui_test_mojo_bindings.mojom',
           ],
           # TODO(sky): this shouldn't be necessary. It's working around a bug in
           # gyp.
           'variables': {
             'mojom_base_output_dir': 'content',
           },
           'includes': [ '../mojo/public/tools/bindings/mojom_bindings_generator.gypi' ],
           'export_dependent_settings': [
             '../mojo/mojo.gyp:mojo_bindings',
-            '../mojo/mojo.gyp:mojo_system',
           ],
         },
         {
           'target_name': 'content_browsertests',
           'type': '<(gtest_target_type)',
           'dependencies': [
             'content.gyp:content_common',
             'content.gyp:content_gpu',
             'content.gyp:content_plugin',
             'content.gyp:content_renderer',
             'content_browser_test_support',
             'content_resources.gyp:content_resources',
             'content_shell_lib',
             'content_shell_pak',
             'test_support_content',
             'web_ui_test_mojo_bindings',
             '../base/base.gyp:test_support_base',
             '../gin/gin.gyp:gin',
             '../gpu/gpu.gyp:gpu',
             '../ipc/ipc.gyp:test_support_ipc',
             '../media/media.gyp:media_test_support',
             '../media/media.gyp:shared_memory_support',
             '../mojo/mojo.gyp:mojo_bindings',
             '../mojo/mojo.gyp:mojo_environment_chromium',
             '../mojo/mojo.gyp:mojo_service_manager',
-            '../mojo/mojo.gyp:mojo_system',
             '../mojo/mojo.gyp:mojo_system_impl',
             '../net/net.gyp:net_test_support',
             '../ppapi/ppapi_internal.gyp:ppapi_host',
             '../ppapi/ppapi_internal.gyp:ppapi_ipc',
             '../ppapi/ppapi_internal.gyp:ppapi_proxy',
             '../ppapi/ppapi_internal.gyp:ppapi_shared',
             '../ppapi/ppapi_internal.gyp:ppapi_unittest_shared',
             '../testing/gmock.gyp:gmock',
             '../testing/gtest.gyp:gtest',
             '../third_party/WebKit/public/blink.gyp:blink',
@@ skipping 783 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }