Fix dependency issue in content_common (gyp)

third_party/WebKit/public/blink.gyp

 #
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #         * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #         * Redistributions in binary form must reproduce the above
@@ skipping 135 matching lines @@
             'dependencies' : [
                 '<(DEPTH)/cc/ipc/cc_ipc.gyp:interfaces',
             ],
             'includes': [
                 '../../../mojo/mojom_bindings_generator_explicit.gypi',
             ],
         },
         {
             # GN version: //third_party/WebKit/public:mojo_bindings
             'target_name': 'mojo_bindings',
+            # Needed because of dependency on generated headers.
+            'hard_dependency': '1',
             'type': 'static_library',
             'dependencies': [
                 'mojo_bindings_blink_mojom',
                 'mojo_bindings_mojom',
                 '../../../mojo/mojo_public.gyp:mojo_cpp_bindings',
                 '../../../device/bluetooth/bluetooth.gyp:bluetooth_mojom',
                 '<(DEPTH)/cc/ipc/cc_ipc.gyp:interfaces',
                 '<(DEPTH)/cc/ipc/cc_ipc.gyp:interfaces_blink',
             ],
         },
@@ skipping 17 matching lines @@
                     'type': 'static_library',
                     'dependencies': [
                         'android_mojo_bindings_mojom',
                         '../../../mojo/mojo_public.gyp:mojo_bindings_java',
                     ],
                 },
             ],
         }],
     ],
 }