Update content_api to match naming conventions, style in ui_api.h

content/content_common.gypi

 # Copyright (c) 2011 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': 'content_common',
       'type': 'static_library',
       'dependencies': [
@@ skipping 39 matching lines @@
         'common/child_trace_message_filter.cc',
         'common/child_trace_message_filter.h',
         'common/chrome_application_mac.h',
         'common/chrome_application_mac.mm',
         'common/chrome_descriptors.h',
         'common/clipboard_messages.h',
         'common/common_param_traits.cc',
         'common/common_param_traits.h',
         'common/content_message_generator.cc',
         'common/content_message_generator.h',
-        'common/content_api.h',
+        'common/content_export.h',
         'common/content_client.cc',
         'common/content_client.h',
         'common/content_constants.cc',
         'common/content_constants.h',
         'common/content_counters.cc',
         'common/content_counters.h',
         'common/content_paths.cc',
         'common/content_paths.h',
         'common/content_restriction.h',
         'common/content_switches.cc',
@@ skipping 270 matching lines @@
           ],
           'sources': [
             'common/gpu/media/omx_video_decode_accelerator_unittest.cc',
           ],
         }
       ],
     },
    ],
   ],
 }