[NaCl SDK] Make the SDK examples buildable as a packaged app.

native_client_sdk/src/examples/load_progress/example.dsc

 {
   'TOOLS': ['newlib', 'glibc', 'pnacl', 'win', 'linux'],
   'TARGETS': [
     {
       'NAME' : 'load_progress',
       'TYPE' : 'main',
       'SOURCES' : ['load_progress.cc'],
       'LIBS': ['ppapi_cpp', 'ppapi', 'pthread']
     }
   ],
   'DATA': [
     'example.js',
   ],
   'DEST': 'examples',
   'NAME': 'load_progress',
   'TITLE': 'Load Progress',
-  'DESC': """
-The Load Progress example demonstrates how to listen for and handle
-events that occur while a NaCl module loads.  This example listens for
-different load event types and dispatches different events to their
-respective handler. This example also checks for valid browser version and
-shows how to calculate and display loading progress.""",
-  'FOCUS': 'Progress event handling.',
   'GROUP': 'Concepts'
 }