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

native_client_sdk/src/examples/sine_synth/example.dsc

 {
   'TOOLS': ['newlib', 'glibc', 'pnacl', 'win', 'linux'],
   'TARGETS': [
     {
       'NAME' : 'sine_synth',
       'TYPE' : 'main',
       'SOURCES' : ['sine_synth.cc'],
       'LIBS': ['ppapi_cpp', 'ppapi', 'pthread']
     }
   ],
   'DATA': [
     'example.js',
   ],
   'DEST': 'examples',
   'NAME': 'sine_synth',
   'TITLE': 'Sine Wave Synthesizer',
-  'DESC': """
-The Sine Wave Synthesizer example demonstrates playing sound (a sine
-wave).  Enter the desired frequency and hit play to start, stop to end. The
-frequency box will display "Loading, please wait." while the module loads.""",
-  'FOCUS': 'Audio.',
   'GROUP': 'API',
 }