CefSharp 43 required .NET 4.0. The CefSharp site also says .NET 4.0 is enough. Suddenly with CefSharp 51 it becomes mandatory for user apps to use .NET 4.5.2. This is not possible since I cannot guarantee all client PCs will have .NET 4.5.2. Is it possible for CefSharp 51 and newer to be built with .NET 4.0? What newer .NET features are required?

• What version of the product are you using?
  • 51, trunk branch, downloaded from NuGet on 2016/08/28
• What architecture x86 or x64?
  • x64 PC, building a x86 project
• On what operating system?
  • Win7 x64
• Are you using WinForms, WPF or OffScreen?
  • WinForms
• What steps will reproduce the problem?
  • Create a new .NET 4.0 project
  • Add 3 CefSharp DLL refs
  • Copy all CefSharp stuff into bin (I don't use NuGet)
  • Build
• What is the expected output? What do you see instead?
  • Expect it to compile with .NET 4.0
• Please provide any additional information below.