Unsigned warning fix - take 2

sandbox/src/restricted_token_unittest.cc

Index: sandbox/src/restricted_token_unittest.cc
===================================================================
--- sandbox/src/restricted_token_unittest.cc	(revision 48256)
+++ sandbox/src/restricted_token_unittest.cc	(working copy)
@@ -23,11 +23,11 @@
 // Tests the initialization with NULL as parameter.
 TEST(RestrictedTokenTest, DefaultInit) {
   // Get the current process token.
-  HANDLE token_handle = NULL;
+  HANDLE token_handle = INVALID_HANDLE_VALUE;
   ASSERT_TRUE(::OpenProcessToken(::GetCurrentProcess(), TOKEN_ALL_ACCESS,
                                  &token_handle));
 
-  ASSERT_NE(NULL, reinterpret_cast<ULONG_PTR>(token_handle));
+  ASSERT_NE(INVALID_HANDLE_VALUE, token_handle);
 
   ATL::CAccessToken access_token;
   access_token.Attach(token_handle);
@@ -62,11 +62,11 @@
 // Tests the initialization with a custom token as parameter.
 TEST(RestrictedTokenTest, CustomInit) {
   // Get the current process token.
-  HANDLE token_handle = NULL;
+  HANDLE token_handle = INVALID_HANDLE_VALUE;
   ASSERT_TRUE(::OpenProcessToken(::GetCurrentProcess(), TOKEN_ALL_ACCESS,
                                  &token_handle));
 
-  ASSERT_NE(NULL, reinterpret_cast<ULONG_PTR>(token_handle));
+  ASSERT_NE(INVALID_HANDLE_VALUE, token_handle);
 
   ATL::CAccessToken access_token;
   access_token.Attach(token_handle);