Fix dependencies for EventInterfaces.in

Source/bindings/generated_bindings.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 257 matching lines @@
     'type': 'none',
     'dependencies': [
       'interfaces_info',
     ],
     'actions': [{
       'action_name': 'generate_event_interfaces',
       'inputs': [
         'scripts/generate_event_interfaces.py',
         'scripts/utilities.py',
         '<(SHARED_INTERMEDIATE_DIR)/blink/InterfacesInfo.pickle',
+        # Conservative: only needs to depend on Event IDL files
+        '<@(static_idl_files)',
       ],
       'outputs': [
         '<(SHARED_INTERMEDIATE_DIR)/blink/EventInterfaces.in',
       ],
       'action': [
         'python',
         'scripts/generate_event_interfaces.py',
         '--interfaces-info-file',
         '<(SHARED_INTERMEDIATE_DIR)/blink/InterfacesInfo.pickle',
         '--event-interfaces-file',
@@ skipping 142 matching lines @@
       ],
       'message': 'Generating aggregate generated bindings files',
     }],
   },
 ################################################################################
   {
     'target_name': 'generated_bindings',
     'type': 'none',
     'dependencies': [
       'aggregate_generated_bindings',
-      'event_interfaces',
       'individual_generated_bindings',
     ],
   },
 ################################################################################
   ],  # targets
 }