Move SupportsNativeDecorations/SupportsNativeDecorationDragging to SDLPlatform

#2800

Source/Engine/Platform/Base/PlatformBase.cpp

@@ -292,24 +292,6 @@ PlatformType PlatformBase::GetPlatformType()
     return PLATFORM_TYPE;
 }
 
-#if !PLATFORM_SDL
-
-bool PlatformBase::SupportsNativeDecorations()
-{
-    return true;
-}
-
-bool PlatformBase::SupportsNativeDecorationDragging()
-{
-#if PLATFORM_LINUX
-    return false;
-#else
-    return true;
-#endif
-}
-
-#endif
-
 bool PlatformBase::Is64BitApp()
 {
 #if PLATFORM_64BITS

Source/Engine/Platform/Base/PlatformBase.h

@@ -369,16 +369,6 @@ public:
     /// </summary>
     API_PROPERTY() static PlatformType GetPlatformType();
 
-    /// <summary>
-    /// Returns true if system provides decorations for windows.
-    /// </summary>
-    API_PROPERTY() static bool SupportsNativeDecorations();
-
-    /// <summary>
-    /// Returns true if system provides support for native window dragging events.
-    /// </summary>
-    API_PROPERTY() static bool SupportsNativeDecorationDragging();
-
     /// <summary>
     /// Returns true if is running 64 bit application (otherwise 32 bit). It's compile-time constant.
     /// </summary>