Change GetGameWindowSize to return game viewport size.

Source/Editor/Managed/ManagedEditor.cpp

@@ -457,24 +457,6 @@ Float2 ManagedEditor::GetGameWindowSize()
     return Float2::Zero;
 }
 
-Float2 ManagedEditor::GetGameWindowViewportSize()
-{
-    if (HasManagedInstance())
-    {
-        if (Internal_GetGameWindowSize == nullptr)
-        {
-            Internal_GetGameWindowSize = GetClass()->GetMethod("Internal_GetGameWindowViewportSize", 1);
-            ASSERT(Internal_GetGameWindowSize);
-        }
-        Float2 size;
-        void* params[1];
-        params[0] = &size;
-        Internal_GetGameWindowSize->Invoke(GetManagedInstance(), params, nullptr);
-        return size;
-    }
-    return Float2::Zero;
-}
-
 bool ManagedEditor::OnAppExit()
 {
     if (!HasManagedInstance())

Source/Editor/Managed/ManagedEditor.h

@@ -133,12 +133,6 @@ public:
     /// <returns>The size.</returns>
     Float2 GetGameWindowSize();
 
-    /// <summary>
-    /// Gets the size of the game window viewport output.
-    /// </summary>
-    /// <returns>The size.</returns>
-    Float2 GetGameWindowViewportSize();
-
     /// <summary>
     /// Called when application code calls exit. Editor may end play mode or exit normally.
     /// </summary>