clang/win: Fix most -Wunused-function warnings in Chromium code.

net/cert/x509_certificate_win.cc

Index: net/cert/x509_certificate_win.cc
diff --git a/net/cert/x509_certificate_win.cc b/net/cert/x509_certificate_win.cc
index 7be74edf621f4899bf0778d47d8d22a319dacb12..808a2847f9bd2287dc53c0838e216fea1e1e90e2 100644
--- a/net/cert/x509_certificate_win.cc
+++ b/net/cert/x509_certificate_win.cc
@@ -35,18 +35,6 @@ typedef crypto::ScopedCAPIHandle<
     crypto::CAPIDestroyerWithFlags<HCERTSTORE,
                                    CertCloseStore, 0> > ScopedHCERTSTORE;
 
-void ExplodedTimeToSystemTime(const base::Time::Exploded& exploded,
-                              SYSTEMTIME* system_time) {
-  system_time->wYear = static_cast<WORD>(exploded.year);
-  system_time->wMonth = static_cast<WORD>(exploded.month);
-  system_time->wDayOfWeek = static_cast<WORD>(exploded.day_of_week);
-  system_time->wDay = static_cast<WORD>(exploded.day_of_month);
-  system_time->wHour = static_cast<WORD>(exploded.hour);
-  system_time->wMinute = static_cast<WORD>(exploded.minute);
-  system_time->wSecond = static_cast<WORD>(exploded.second);
-  system_time->wMilliseconds = static_cast<WORD>(exploded.millisecond);
-}
-
 //-----------------------------------------------------------------------------
 
 // Decodes the cert's subjectAltName extension into a CERT_ALT_NAME_INFO