Pass wxSharedPtr argument of RegisterFactory() by const reference

Avoid extra copies from passing it by value.

include/wx/webrequest.h

@@ -241,7 +241,8 @@ public:
 
     static wxWebSession* New(const wxString& backend = wxWebSessionBackendDefault);
 
-    static void RegisterFactory(const wxString& backend, wxSharedPtr<wxWebSessionFactory> factory);
+    static void RegisterFactory(const wxString& backend,
+                                const wxSharedPtr<wxWebSessionFactory>& factory);
 
     static bool IsBackendAvailable(const wxString& backend);
 

interface/wx/webrequest.h

@@ -544,7 +544,8 @@ public:
         @param backend The name for the new backend to be registered under
         @param factory A shared pointer to the factory which creates the appropriate backend.
     */
-    static void RegisterFactory(const wxString& backend, wxSharedPtr<wxWebSessionFactory> factory);
+    static void RegisterFactory(const wxString& backend,
+                                const wxSharedPtr<wxWebSessionFactory>& factory);
 
     /**
         Allows to check if the specified backend is available at runtime.

src/common/webrequest.cpp

@@ -431,7 +431,9 @@ wxWebSession* wxWebSession::New(const wxString& backend)
 }
 
 // static
-void wxWebSession::RegisterFactory(const wxString& backend, wxSharedPtr<wxWebSessionFactory> factory)
+void
+wxWebSession::RegisterFactory(const wxString& backend,
+                              const wxSharedPtr<wxWebSessionFactory>& factory)
 {
     ms_factoryMap[backend] = factory;
 }