Move MatchPattern to its own header and the base namespace.

content/test/image_decoder_test.cc

Index: content/test/image_decoder_test.cc
diff --git a/content/test/image_decoder_test.cc b/content/test/image_decoder_test.cc
index 5e9886ec106d409b742b2c76ed5c32c612f4bce4..3861f38bc46c41eadbe6ff9b200c91f60861a363 100644
--- a/content/test/image_decoder_test.cc
+++ b/content/test/image_decoder_test.cc
@@ -10,6 +10,7 @@
 #include "base/md5.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
+#include "base/strings/pattern.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "third_party/WebKit/public/platform/WebData.h"
@@ -132,7 +133,7 @@ std::vector<base::FilePath> ImageDecoderTest::GetImageFiles() const {
 #else
     std::string base_name_ascii = base_name.value();
 #endif
-    if (MatchPattern(base_name_ascii, pattern))
+    if (base::MatchPattern(base_name_ascii, pattern))
       image_files.push_back(next_file_name);
   }