some more s/GetSize/size/ and other minor STLisms

stepmania/src/SongCacheIndex.cpp

@@ -30,7 +30,7 @@ void SongCacheIndex::ReadCacheIndex()
 	LOG->Trace( "Cache format is out of date.  Deleting all cache files." );
 	CStringArray asCacheFileNames;
 	GetDirListing( "Cache/*.*", asCacheFileNames );
-	for( int i=0; i<asCacheFileNames.GetSize(); i++ )
+	for( unsigned i=0; i<asCacheFileNames.size(); i++ )
 		DeleteFile( "Cache/" + asCacheFileNames[i] );
 	CacheIndex.Reset();
 }