shdocvw: Don't use BSTR in navigate_url prototype.

dlls/shdocvw/navigate.c

@@ -514,7 +514,7 @@ static HRESULT bind_url_to_object(DocHost *This, LPCWSTR url, PBYTE post_data, U
     return hres;
 }
 
-HRESULT navigate_url(DocHost *This, BSTR url, const VARIANT *Flags,
+HRESULT navigate_url(DocHost *This, LPCWSTR url, const VARIANT *Flags,
                      const VARIANT *TargetFrameName, VARIANT *PostData, VARIANT *Headers)
 {
     PBYTE post_data = NULL;

dlls/shdocvw/shdocvw.h

@@ -194,7 +194,7 @@ HRESULT WebBrowserV2_Create(IUnknown*,REFIID,void**);
 void create_doc_view_hwnd(DocHost*);
 void deactivate_document(DocHost*);
 void call_sink(ConnectionPoint*,DISPID,DISPPARAMS*);
-HRESULT navigate_url(DocHost*,BSTR,const VARIANT*,const VARIANT*,VARIANT*,VARIANT*);
+HRESULT navigate_url(DocHost*,LPCWSTR,const VARIANT*,const VARIANT*,VARIANT*,VARIANT*);
 
 HRESULT InternetExplorer_Create(IUnknown*,REFIID,void**);
 void InternetExplorer_WebBrowser_Init(InternetExplorer*);