Move MatchPattern to its own header and the base namespace.

url/origin.cc

Index: url/origin.cc
diff --git a/url/origin.cc b/url/origin.cc
index 8aaa173fa5e0d98728067daca5af80b349e0ba28..d800310b203eccc0d5bb873e077bbe3c7e8660e3 100644
--- a/url/origin.cc
+++ b/url/origin.cc
@@ -4,6 +4,7 @@
 
 #include "url/origin.h"
 
+#include "base/strings/pattern.h"
 #include "base/strings/string_util.h"
 
 namespace url {
@@ -11,7 +12,7 @@ namespace url {
 Origin::Origin() : string_("null") {}
 
 Origin::Origin(const std::string& origin) : string_(origin) {
-  DCHECK(origin == "null" || MatchPattern(origin, "?*://?*"));
+  DCHECK(origin == "null" || base::MatchPattern(origin, "?*://?*"));
   DCHECK_GT(origin.size(), 0u);
   DCHECK(origin == "file://" || origin[origin.size() - 1] != '/');
 }