Rework ExtensionApiUnittest to run in extensions_unittests, removing its Chrome dependencies.

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 247 matching lines @@
                   'shell/resources/missingImage.png',
                   'shell/resources/textAreaResizeCorner.png',
                 ],
               }],
             }],
           ],
           'dependencies': [
             'content.gyp:content_child',
             'content.gyp:content_common',
             'content.gyp:content_gpu',
+            'content.gyp:content_plugin',

[Yoyo Zhou, 2014/08/27 23:27:33]

jam: FYI, I think adding this fixes the link errors with PluginMain in
content_app_both. (Because of the strange way content_main_runner is built, I
think it can't be added to content_app*'s dependencies.)

             'content.gyp:content_ppapi_plugin',
             'content.gyp:content_renderer',
             'content.gyp:content_utility',
             '../cc/blink/cc_blink.gyp:cc_blink',
             '../cc/cc.gyp:cc',
             '../cc/cc_tests.gyp:cc_test_support',
             '../media/media.gyp:media',
             '../ppapi/ppapi_internal.gyp:ppapi_host',
             '../ppapi/ppapi_internal.gyp:ppapi_proxy',
             '../ppapi/ppapi_internal.gyp:ppapi_shared',
@@ skipping 1600 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }