Fix some grammar in sidestep_resolver.cc

sandbox/src/sidestep_resolver.cc

Index: sandbox/src/sidestep_resolver.cc
diff --git a/sandbox/src/sidestep_resolver.cc b/sandbox/src/sidestep_resolver.cc
index 0a2803cb333170bfa9aa9b708ce16aedafefa8dc..e22ca6b128cdef12d8579001ad8a1e6b5e99037b 100644
--- a/sandbox/src/sidestep_resolver.cc
+++ b/sandbox/src/sidestep_resolver.cc
@@ -75,7 +75,7 @@ size_t SidestepResolverThunk::GetThunkSize() const {
 // the thunk to use a chained interceptor. It uses the fact that
 // SetInternalThunk generates the code to pass as the first parameter whatever
 // it receives as original_function; we let SidestepResolverThunk set this value
-// to it's saved code, and then we change it to our thunk data.
+// to its saved code, and then we change it to our thunk data.
 NTSTATUS SmartSidestepResolverThunk::Setup(const void* target_module,
                                            const void* interceptor_module,
                                            const char* target_name,