Cleanup sandbox/ in advance of re-enabling some MSVC warnings.

sandbox/win/src/process_mitigations.cc

Index: sandbox/win/src/process_mitigations.cc
diff --git a/sandbox/win/src/process_mitigations.cc b/sandbox/win/src/process_mitigations.cc
index 5e242f3abfa1df66c9fd69574208f87ce5bdf09c..80e428483052b606211c977572ea57bb13d9255b 100644
--- a/sandbox/win/src/process_mitigations.cc
+++ b/sandbox/win/src/process_mitigations.cc
@@ -79,10 +79,10 @@ bool ApplyProcessMitigationsToCurrentProcess(MitigationFlags flags) {
     } else {
       // We're on XP sp2, so use the less standard approach.
       // For reference: http://www.uninformed.org/?v=2&a=4
-      const int MEM_EXECUTE_OPTION_ENABLE = 1;
-      const int MEM_EXECUTE_OPTION_DISABLE = 2;
-      const int MEM_EXECUTE_OPTION_ATL7_THUNK_EMULATION = 4;
-      const int MEM_EXECUTE_OPTION_PERMANENT = 8;
+      static const int MEM_EXECUTE_OPTION_ENABLE = 1;
+      static const int MEM_EXECUTE_OPTION_DISABLE = 2;
+      static const int MEM_EXECUTE_OPTION_ATL7_THUNK_EMULATION = 4;
+      static const int MEM_EXECUTE_OPTION_PERMANENT = 8;
 
       NtSetInformationProcessFunction set_information_process = NULL;
       ResolveNTFunctionPtr("NtSetInformationProcess",