Add an example for using the URLLoader in streaming mode. This also avoids the

ppapi/cpp/url_loader.h

Index: ppapi/cpp/url_loader.h
===================================================================
--- ppapi/cpp/url_loader.h	(revision 91867)
+++ ppapi/cpp/url_loader.h	(working copy)
@@ -17,64 +17,7 @@
 
 // URLLoader provides an API to download URLs.
 //
-// EXAMPLE USAGE:
-//
-//   class MyHandler {
-//    public:
-//     MyHandler(Instance* instance)
-//         : factory_(this),
-//           loader_(instance),
-//           did_open_(false) {
-//     }
-//     void ProcessURL(const char* url) {
-//       CompletionCallback* cc = NewCallback();
-//       int32_t rv = loader_.Open(MakeRequest(url), cc);
-//       if (rv != PP_Error_WouldBlock)
-//         cc->Run(rv);
-//     }
-//    private:
-//     CompletionCallback* NewCallback() {
-//       return factory_.NewOptionalCallback(&MyHandler::DidCompleteIO);
-//     }
-//     URLRequestInfo MakeRequest(const char* url) {
-//       URLRequestInfo request;
-//       request.SetURL(url);
-//       request.SetMethod("GET");
-//       request.SetFollowRedirects(true);
-//       return request;
-//     }
-//     void DidCompleteIO(int32_t result) {
-//       if (result > 0) {
-//         // buf_ now contains 'result' number of bytes from the URL.
-//         ProcessBytes(buf_, result);
-//         ReadMore();
-//       } else if (result == PP_OK && !did_open_) {
-//         // Headers are available, and we can start reading the body.
-//         did_open_ = true;
-//         ProcessResponseInfo(loader_.GetResponseInfo());
-//         ReadMore();
-//       } else {
-//         // Done reading (possibly with an error given by 'result').
-//       }
-//     }
-//     void ReadMore() {
-//       CompletionCallback* cc = NewCallback();
-//       int32_t rv = fio_.Read(offset_, buf_, sizeof(buf_), cc);
-//       if (rv != PP_Error_WouldBlock)
-//         cc->Run(rv);
-//     }
-//     void ProcessResponseInfo(const URLResponseInfo& response_info) {
-//       // Read response headers, etc.
-//     }
-//     void ProcessBytes(const char* bytes, int32_t length) {
-//       // Do work ...
-//     }
-//     pp::CompletionCallbackFactory<MyHandler> factory_;
-//     pp::URLLoader loader_;
-//     char buf_[4096];
-//     bool did_open_;
-//   };
-//
+// Please see the example in ppapi/examples/url_loader/url_loader.cc.
 class URLLoader : public Resource {
  public:
   // Creates an is_null() URLLoader object.