Make sure IE and Engine are actually being closed by custom action

installer/src/installer-lib/test/test-installer-lib-sandbox.cpp

 /**
  * \file test-installer-lib-sandbox.cpp
  *
  * Automatic testing of many of the units within the custom action is infeasible.
  * In one case, they rely on the execution environment within an installation session.
  * In another, they rely on the operation system environment as a whole.
  * In these cases, it's easier to verify behavior manually.
  *
  * This file contains a custom action function sandbox() as well as a number of test functions.
  * At any given time, not all of the test functions need to be referenced within the body of custom action.
@@ skipping 62 matching lines @@
       session.log( s.str() ) ;
     }
     return true ;
   }
 } ;
 
 void log_IE_window_handles( Immediate_Session & session )
 {
   session.log( "log_IE_window_handles" ) ;
   const wchar_t * IE_names[] = { L"IExplore.exe", L"AdblockPlusEngine.exe" } ;
-  const wchar_t * ABP_names[] = { L"AdblockPlus32.dll", L"AdblockPlus64.dll" } ;
   Process_Snapshot snapshot ;
-  Process_Closer iec( snapshot, IE_names,  ABP_names) ;
+  Process_Closer iec(snapshot, IE_names) ;
   log_single_window_handle_only_if_IE lp( session, iec ) ;
   enumerate_windows( lp ) ;
 }
 
 //-------------------------------------------------------
 // log_only_window_handle_in_closer
 //-------------------------------------------------------
 void log_only_window_handle_in_closer( Immediate_Session & session )
 {
   session.log( "log_only_window_handle_in_closer" ) ;
   const wchar_t * IE_names[] = { L"IExplore.exe", L"AdblockPlusEngine.exe" } ;
-  const wchar_t * ABP_names[] = { L"AdblockPlus32.dll", L"AdblockPlus64.dll" } ;
   Process_Snapshot snapshot ;
-  Process_Closer iec( snapshot, IE_names, ABP_names) ;
+  Process_Closer iec( snapshot, IE_names) ;
   iec.iterate_our_windows( log_single_window_handle( session ) ) ;
 }
 
 //-------------------------------------------------------
 // sandbox
 //-------------------------------------------------------
 /**
  * Exposed DLL entry point for custom action. 
  * The function signature matches the calling convention used by Windows Installer.
 
@@ skipping 23 matching lines @@
   }
   catch( ... )
   {
     session.log_noexcept( "Caught an exception" ) ;
     return ERROR_INSTALL_FAILURE ;
   }
 
   return ERROR_SUCCESS ;
 }