Removing useless Win7 checks + standardize its use

sandbox/win/src/process_mitigations_test.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sandbox/win/src/process_mitigations.h"
 
 #include <d3d9.h>
 #include <initguid.h>
 #include <opmapi.h>
 #include <psapi.h>
@@ skipping 930 matching lines @@
         (MEM_EXECUTE_OPTION_DISABLE | MEM_EXECUTE_OPTION_PERMANENT)) {
       return SBOX_TEST_FOURTH_ERROR;
     }
   }
 
   return SBOX_TEST_SUCCEEDED;
 }
 
 #if !defined(_WIN64)  // DEP is always enabled on 64-bit.
 TEST(ProcessMitigationsTest, CheckDep) {
-  if (base::win::GetVersion() > base::win::VERSION_WIN7)
+  if (base::win::GetVersion() >= base::win::VERSION_WIN8)
     return;
 
   TestRunner runner;
   sandbox::TargetPolicy* policy = runner.GetPolicy();
 
   EXPECT_EQ(policy->SetProcessMitigations(MITIGATION_DEP |
                                           MITIGATION_DEP_NO_ATL_THUNK |
                                           MITIGATION_SEHOP),
             SBOX_ALL_OK);
   EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner.RunTest(L"CheckDep"));
@@ skipping 843 matching lines @@
   cmd = cmd.Append(L"calc.exe");
 
   std::wstring test_command(base::StringPrintf(L"TestChildProcess %ls 0x%08X",
                                                cmd.value().c_str(),
                                                STATUS_ACCESS_VIOLATION));
 
   EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner.RunTest(test_command.c_str()));
 }
 
 }  // namespace sandbox