Enable DPI aware setting in Lazarus demos for Windows

Cleanup some useless code in Lazarus demos for Windows

demos/Lazarus_Windows/SimpleOSRBrowser/SimpleOSRBrowser.lpi

@@ -16,6 +16,9 @@
       <UseAppBundle Value="False"/>
       <ResourceType Value="res"/>
       <UseXPManifest Value="True"/>
+      <XPManifest>
+        <DpiAware Value="True/PM_V2"/>
+      </XPManifest>
       <Icon Value="0"/>
     </General>
     <BuildModes Count="1">

demos/Lazarus_Windows/SimpleOSRBrowser/SimpleOSRBrowser.lpr

@@ -4,14 +4,13 @@ program SimpleOSRBrowser;
 
 uses
   Forms,
-  LCLIntf, LCLType, LMessages, Interfaces,
+  Windows,
+  Interfaces,
   uCEFApplication,
   usimplelazosrbrowser in 'uSimpleOSRBrowser.pas' {Form1};
 
-{$IFDEF MSWINDOWS}
-  // CEF3 needs to set the LARGEADDRESSAWARE flag which allows 32-bit processes to use up to 3GB of RAM.
-  {$SetPEFlags $20}
-{$ENDIF}
+// CEF needs to set the LARGEADDRESSAWARE ($20) flag which allows 32-bit processes to use up to 3GB of RAM.
+{$IFDEF WIN32}{$SetPEFlags IMAGE_FILE_LARGE_ADDRESS_AWARE}{$ENDIF}
 
 {$R *.res}