Remove stl_util's STLDeleteContainerPairSecondPointers from storage/.

storage/browser/fileapi/external_mount_points.h

Index: storage/browser/fileapi/external_mount_points.h
diff --git a/storage/browser/fileapi/external_mount_points.h b/storage/browser/fileapi/external_mount_points.h
index af853d73a972882b10ac53cc00a16b1d9d0e73cd..36f5ebd5ed21457078f0db10ff85b83dd3da6a3f 100644
--- a/storage/browser/fileapi/external_mount_points.h
+++ b/storage/browser/fileapi/external_mount_points.h
@@ -6,6 +6,7 @@
 #define STORAGE_BROWSER_FILEAPI_EXTERNAL_MOUNT_POINTS_H_
 
 #include <map>
+#include <memory>
 #include <string>
 #include <vector>
 
@@ -119,7 +120,7 @@ class STORAGE_EXPORT ExternalMountPoints
   // Represents each file system instance (defined in the .cc).
   class Instance;
 
-  typedef std::map<std::string, Instance*> NameToInstance;
+  typedef std::map<std::string, std::unique_ptr<Instance>> NameToInstance;
 
   // Reverse map from registered path to its corresponding mount name.
   typedef std::map<base::FilePath, std::string> PathToName;