Move MatchPattern to its own header and the base namespace.

net/cert/mock_cert_verifier.cc

Index: net/cert/mock_cert_verifier.cc
diff --git a/net/cert/mock_cert_verifier.cc b/net/cert/mock_cert_verifier.cc
index ba89b7137fb3a6d51d5cc1d7a891e42368cd0fee..6ee23d6483c1c885cfaf9036d15af117666145f7 100644
--- a/net/cert/mock_cert_verifier.cc
+++ b/net/cert/mock_cert_verifier.cc
@@ -5,6 +5,7 @@
 #include "net/cert/mock_cert_verifier.h"
 
 #include "base/memory/ref_counted.h"
+#include "base/strings/pattern.h"
 #include "base/strings/string_util.h"
 #include "net/base/net_errors.h"
 #include "net/cert/cert_status_flags.h"
@@ -50,7 +51,7 @@ int MockCertVerifier::Verify(X509Certificate* cert,
     // Check just the server cert. Intermediates will be ignored.
     if (!it->cert->Equals(cert))
       continue;
-    if (!MatchPattern(hostname, it->hostname))
+    if (!base::MatchPattern(hostname, it->hostname))
       continue;
     *verify_result = it->result;
     return it->rv;