win: Fix remaining plugin warnings in ash, device, printing, sandbox.

sandbox/win/src/handle_closer_agent.cc

Index: sandbox/win/src/handle_closer_agent.cc
diff --git a/sandbox/win/src/handle_closer_agent.cc b/sandbox/win/src/handle_closer_agent.cc
index 1fa82553bb05c4677903702162a43e01e1ff2529..9a79d556dee55e3dda8e8f8c55b237209f1ee71f 100644
--- a/sandbox/win/src/handle_closer_agent.cc
+++ b/sandbox/win/src/handle_closer_agent.cc
@@ -45,6 +45,9 @@ HandleCloserAgent::HandleCloserAgent()
     : dummy_handle_(::CreateEvent(NULL, FALSE, FALSE, NULL)) {
 }
 
+HandleCloserAgent::~HandleCloserAgent() {
+}
+
 // Attempts to stuff |closed_handle| with a duplicated handle for a dummy Event
 // with no access. This should allow the handle to be closed, to avoid
 // generating EXCEPTION_INVALID_HANDLE on shutdown, but nothing else. For now