Restructure sandbox code to reduce dependencies pulled in by intercept code.

sandbox/win/src/sandbox_nt_util.h

Index: sandbox/win/src/sandbox_nt_util.h
diff --git a/sandbox/win/src/sandbox_nt_util.h b/sandbox/win/src/sandbox_nt_util.h
index e5d45fa2f2ae24060e46a19e1462c356c5c033a5..7c543f2ac30800ca9f5eba438ef99597ee61877e 100644
--- a/sandbox/win/src/sandbox_nt_util.h
+++ b/sandbox/win/src/sandbox_nt_util.h
@@ -45,6 +45,8 @@ void __cdecl operator delete(void* memory, void* buffer,
 #define VERIFY_SUCCESS(action) (action)
 #endif
 
+#define CHECK_NT(condition) { (condition) ? (void)0 : __debugbreak(); }
+
 #define NOTREACHED_NT() DCHECK_NT(false)
 
 namespace sandbox {
@@ -94,7 +96,6 @@ enum RequiredAccess {
 // write)
 bool ValidParameter(void* buffer, size_t size, RequiredAccess intent);
 
-
 // Copies data from a user buffer to our buffer. Returns the operation status.
 NTSTATUS CopyData(void* destination, const void* source, size_t bytes);