Remove PPB_Ext_Alarms_Dev and PPB_Ext_Events_Dev.

native_client_sdk/src/libraries/ppapi_cpp/library.dsc

 {
   'TOOLS': ['newlib', 'glibc', 'pnacl', 'win', 'linux'],
   'SEARCH': [
       '../../../../ppapi/cpp',
       '../../../../ppapi/cpp/dev',
       '../../../../ppapi/cpp/extensions',
       '../../../../ppapi/cpp/extensions/dev',
       '../../../../ppapi/utility',
       '../../../../ppapi/utility/graphics',
       '../../../../ppapi/utility/threading',
@@ skipping 69 matching lines @@
         'cursor_control_dev.cc',
         'device_ref_dev.cc',
         'printing_dev.cc',
         'scriptable_object_deprecated.cc',
         'audio_input_dev.cc',
         'scrollbar_dev.cc',
         'graphics_2d_dev.cc',
         'widget_dev.cc',
         'var_resource_dev.cc',
 
-        # ppapi/cpp/extensions
-        'event_base.cc',
-
         # ppapi/cpp/extensions/dev
-        'alarms_dev.cc',
-        'events_dev.cc',
         'socket_dev.cc',
 
         # ppapi/utility/graphics
         'paint_aggregator.cc',
         'paint_manager.cc',
 
         # ppapi/utility/websocket
         'websocket_api.cc',
 
         # ppapi/utility/threading
@@ skipping 85 matching lines @@
         'view_dev.h',
         'widget_client_dev.h',
         'widget_dev.h',
         'zoom_dev.h',
       ],
       'DEST': 'include/ppapi/cpp/dev',
     },
     {
       'FILES': [
         'dict_field.h',
-        'event_base.h',
         'ext_output_traits.h',
         'from_var_converter.h',
         'optional.h',
         'to_var_converter.h',
       ],
       'DEST': 'include/ppapi/cpp/extensions',
     },
     {
       'FILES': [
-        'alarms_dev.h',
-        'events_dev.h',
         'socket_dev.h',
       ],
       'DEST': 'include/ppapi/cpp/extensions/dev',
     },
     {
       'FILES': [
         'completion_callback_factory.h',
         'completion_callback_factory_thread_traits.h',
       ],
       'DEST': 'include/ppapi/utility',
@@ skipping 23 matching lines @@
         'lock.h',
         'simple_thread.h',
       ],
       'DEST': 'include/ppapi/utility/threading',
     },
   ],
   'DEST': 'src',
   'NAME': 'ppapi_cpp',
 }