nsPIPluginHost in Firefox 2.0

 To create tmp file with Content len header in, it will use by http POST

  Deletes plugin native window object created by NewPluginNativeWindow

  Creates a new plugin native window object

 This method parses post buffer to find out case insensitive "Content-length" string
 and CR or LF some where after that, then it assumes there is http headers in
 the input buffer and continue to search for end of headers (CRLFCRLF or LFLF).
 It will *always malloc()* output buffer (caller is responsible to free it) 
 if input buffer starts with LF, which comes from 4.x spec 
 http://developer.netscape.com/docs/manuals/communicator/plugin/pgfn2.htm#1007754
 "If no custom headers are required, simply add a blank
 line ('
') to the beginning of the file or buffer.",
 it skips that '
' and considers rest of the input buffer as data.
 If "Content-length" string and end of headers is found 
   it substitutes single LF with CRLF in the headers, so the end of headers
   always will be CRLFCRLF (single CR in headers, if any, remain untouched)
 else
   it puts "Content-length: "+size_of_data+CRLFCRLF at the beginning of the output buffer
 and memcpy data to the output buffer 

 On failure outPostData and outPostDataLen will be set in 0.  
 @param aInPostData      - the post data
 @param aInPostDataLen   - the length aInPostData
 @param aOutPostData     - the buffer
 @param aOutPostDataLen  - the length of aOutPostData

 To notify the plugin manager that the plugin created a script object