Issue #1356 - Improve detection of the issuer of the request

src/plugin/PluginWbPassThrough.h

 #pragma once
 #include <cstdint>
 #include "ProtocolCF.h"
 #include "ProtocolImpl.h"
 #define IE_MAX_URL_LENGTH 2048
 
 class WBPassthruSink :
         public PassthroughAPP::CInternetProtocolSinkWithSP<WBPassthruSink, CComMultiThreadModel>,
         public IHttpNegotiate
 {
         typedef PassthroughAPP::CInternetProtocolSinkWithSP<WBPassthruSink, CComMultiThreadModel> BaseClass;
 
 public:
         WBPassthruSink();
 
         uint64_t m_currentPositionOfSentPage;
         CComPtr<IInternetProtocol> m_pTargetProtocol;
         int m_contentType;
         std::wstring m_boundDomain;
         bool m_blockedInTransaction;
 
         int GetContentTypeFromMimeType(const CString& mimeType);
         int GetContentTypeFromURL(const CString& src);
         int GetContentType(const CString& mimeType, const std::wstring& domain, const CString& src);
+        bool IsFlashRequest();
 public:
         BEGIN_COM_MAP(WBPassthruSink)
                 COM_INTERFACE_ENTRY(IHttpNegotiate)
                 COM_INTERFACE_ENTRY_CHAIN(BaseClass)
         END_COM_MAP()
 
         BEGIN_SERVICE_MAP(WBPassthruSink)
                 SERVICE_ENTRY(IID_IHttpNegotiate)
         END_SERVICE_MAP()
 
@@ skipping 39 matching lines @@
   STDMETHODIMP Start(LPCWSTR szUrl, IInternetProtocolSink *pOIProtSink,
     IInternetBindInfo *pOIBindInfo, DWORD grfPI, HANDLE_PTR dwReserved) override;
 
   //IInternetProtocol
   STDMETHODIMP Read(/* [in, out] */ void *pv,/* [in] */ ULONG cb,/* [out] */ ULONG *pcbRead) override;
 
   STDMETHODIMP LockRequest(/* [in] */ DWORD dwOptions) override;
   STDMETHODIMP UnlockRequest() override;
 
   bool m_shouldSupplyCustomContent;
-  bool m_hasOriginalStartCalled;
 };