Issue #1234 - standardize some string conversions

src/plugin/PluginWbPassThrough.cpp

 #include "PluginStdAfx.h"
 
 #include "PluginWbPassThrough.h"
 #include "PluginClient.h"
 #include "PluginClientFactory.h"
 #include "PluginFilter.h"
 #include "PluginSettings.h"
 #include "PluginClass.h"
 #include "PluginSystem.h"
 
@@ skipping 153 matching lines @@
 
 
   if (tab && client)
   {
     CString documentUrl = tab->GetDocumentUrl();
     // Page is identical to document => don't block
     if (documentUrl == src)
     {
       // fall through
     }
-    else if (CPluginSettings::GetInstance()->IsPluginEnabled() && !client->IsWhitelistedUrl(std::wstring(documentUrl)))
+    else if (CPluginSettings::GetInstance()->IsPluginEnabled() && !client->IsWhitelistedUrl(to_wstring(documentUrl)))
     {
       boundDomain = tab->GetDocumentUrl();
       contentType = CFilter::contentTypeAny;
       if ((tab != 0) && (tab->IsFrameCached(src)))
       {
         contentType = CFilter::contentTypeSubdocument;
       }
       else
       {
         contentType = GetContentType(mimeType, boundDomain, src);
@@ skipping 202 matching lines @@
   return OnStart(szUrl, pOIProtSink, pOIBindInfo, grfPI,
     dwReserved, m_spInternetProtocol);
 }
 
  STDMETHODIMP WBPassthru::Read( /* [in, out] */ void *pv,/* [in] */ ULONG cb,/* [out] */ ULONG *pcbRead)
  {
    
    WBPassthruSink* pSink = GetSink();
    return pSink->Read(pv, cb, pcbRead);
  }