Delete Filesystem::IterateDirectory and Filesystem::OpenFile.

webrtc/base/unixfilesystem.h

Index: webrtc/base/unixfilesystem.h
diff --git a/webrtc/base/unixfilesystem.h b/webrtc/base/unixfilesystem.h
index 6a124ff6b70d4ee555605af953b909d16bcadc0a..7d4859a7a5c4df2445059b98e28470ad5836d122 100644
--- a/webrtc/base/unixfilesystem.h
+++ b/webrtc/base/unixfilesystem.h
@@ -34,11 +34,6 @@ class UnixFilesystem : public FilesystemInterface {
   static void SetAppTempFolder(const std::string& folder);
 #endif
 
-  // Opens a file. Returns an open StreamInterface if function succeeds.
-  // Otherwise, returns null.
-  FileStream* OpenFile(const Pathname& filename,
-                       const std::string& mode) override;
-
   // This will attempt to delete the file located at filename.
   // It will fail with VERIY if you pass it a non-existant file, or a directory.
   bool DeleteFile(const Pathname& filename) override;