Change wxWebRequest and related objects to hide ref counting

Don't force the application code to deal with wxObjectDataPtr<> or,
worse, calling {Inc,Dec}Ref() manually by hiding it inside the wx
objects themselves and giving the value-like semantics to them.

There should be no real changes in the behaviour, but the API does
change significantly. Notably, wxWebRequest is not a wxEvtHandler itself
any longer, as this would be incompatible with the value semantics, and
an event handler needs to be specified when creating it, so that it
could be notified about the request state changes.

include/wx/private/webrequest_curl.h

@@ -19,13 +19,15 @@
 
 #include "curl/curl.h"
 
-class wxWebResponseCURL;
 class wxWebRequestCURL;
+class wxWebResponseCURL;
+class wxWebSessionCURL;
 
-class WXDLLIMPEXP_NET wxWebAuthChallengeCURL : public wxWebAuthChallenge
+class wxWebAuthChallengeCURL : public wxWebAuthChallengeImpl
 {
 public:
-    wxWebAuthChallengeCURL(Source source, wxWebRequestCURL& request);
+    wxWebAuthChallengeCURL(wxWebAuthChallenge::Source source,
+                           wxWebRequestCURL& request);
 
     bool Init();
 
@@ -37,10 +39,14 @@ private:
     wxDECLARE_NO_COPY_CLASS(wxWebAuthChallengeCURL);
 };
 
-class WXDLLIMPEXP_NET wxWebRequestCURL : public wxWebRequest
+class wxWebRequestCURL : public wxWebRequestImpl
 {
 public:
-    wxWebRequestCURL(wxWebSession& session, int id, const wxString& url);
+    wxWebRequestCURL(wxWebSession& session,
+                     wxWebSessionCURL& sessionImpl,
+                     wxEvtHandler* handler,
+                     const wxString& url,
+                     int id);
 
     ~wxWebRequestCURL();
 
@@ -48,10 +54,11 @@ public:
 
     void Cancel() wxOVERRIDE;
 
-    wxWebResponse* GetResponse() const wxOVERRIDE;
+    wxWebResponseImplPtr GetResponse() const wxOVERRIDE
+        { return m_response; }
 
-    wxWebAuthChallenge* GetAuthChallenge() const wxOVERRIDE
-    { return m_authChallenge.get(); }
+    wxWebAuthChallengeImplPtr GetAuthChallenge() const wxOVERRIDE
+        { return m_authChallenge; }
 
     wxFileOffset GetBytesSent() const wxOVERRIDE;
 
@@ -68,11 +75,13 @@ public:
     size_t ReadData(char* buffer, size_t size);
 
 private:
+    wxWebSessionCURL& m_sessionImpl;
+
     CURL* m_handle;
     char m_errorBuffer[CURL_ERROR_SIZE];
     struct curl_slist *m_headerList;
-    wxScopedPtr<wxWebResponseCURL> m_response;
-    wxScopedPtr<wxWebAuthChallengeCURL> m_authChallenge;
+    wxObjectDataPtr<wxWebResponseCURL> m_response;
+    wxObjectDataPtr<wxWebAuthChallengeCURL> m_authChallenge;
     wxFileOffset m_bytesSent;
 
     void DestroyHeaderList();
@@ -80,10 +89,10 @@ private:
     wxDECLARE_NO_COPY_CLASS(wxWebRequestCURL);
 };
 
-class WXDLLIMPEXP_NET wxWebResponseCURL : public wxWebResponse
+class wxWebResponseCURL : public wxWebResponseImpl
 {
 public:
-    wxWebResponseCURL(wxWebRequest& request);
+    explicit wxWebResponseCURL(wxWebRequestCURL& request);
 
     wxInt64 GetContentLength() const wxOVERRIDE;
 
@@ -109,14 +118,18 @@ private:
     wxDECLARE_NO_COPY_CLASS(wxWebResponseCURL);
 };
 
-class WXDLLIMPEXP_NET wxWebSessionCURL : public wxWebSession, private wxThreadHelper
+class wxWebSessionCURL : public wxWebSessionImpl, private wxThreadHelper
 {
 public:
     wxWebSessionCURL();
 
     ~wxWebSessionCURL();
 
-    wxWebRequest* CreateRequest(const wxString& url, int id = wxID_ANY) wxOVERRIDE;
+    wxWebRequestImplPtr
+    CreateRequest(wxWebSession& session,
+                  wxEvtHandler* handler,
+                  const wxString& url,
+                  int id = wxID_ANY) wxOVERRIDE;
 
     wxVersionInfo GetLibraryVersionInfo() wxOVERRIDE;
 
@@ -140,10 +153,10 @@ private:
     wxDECLARE_NO_COPY_CLASS(wxWebSessionCURL);
 };
 
-class WXDLLIMPEXP_NET wxWebSessionFactoryCURL : public wxWebSessionFactory
+class wxWebSessionFactoryCURL : public wxWebSessionFactory
 {
 public:
-    wxWebSession* Create() wxOVERRIDE
+    wxWebSessionImpl* Create() wxOVERRIDE
     { return new wxWebSessionCURL(); }
 };