LPARAM is dependent on target platform so changing to int64 so both x86 and x64 are the same

Author: amaitland

CefSharp.Core/ManagedCefBrowserAdapter.h

@@ -175,7 +175,7 @@ namespace CefSharp
             }
         }
 
-        bool SendKeyEvent(int message, int wParam, LPARAM lParam)
+        bool SendKeyEvent(int message, int wParam, int64 lParam)
         {
             auto browser = _clientAdapter->GetCefBrowser();