Delete class DirectoryIterator and FileRotatingStream read support.

webrtc/base/filerotatingstream.h

Index: webrtc/base/filerotatingstream.h
diff --git a/webrtc/base/filerotatingstream.h b/webrtc/base/filerotatingstream.h
index a3e808cda52670f7e9e3b67294bab9b9b6838318..97520fbbfe59e1b2ecc406a523d229f20e3997d4 100644
--- a/webrtc/base/filerotatingstream.h
+++ b/webrtc/base/filerotatingstream.h
@@ -82,14 +82,6 @@ class FileRotatingStream : public StreamInterface {
   virtual void OnRotation() {}
 
  private:
-  enum Mode { kRead, kWrite };
-
-  FileRotatingStream(const std::string& dir_path,
-                     const std::string& file_prefix,
-                     size_t max_file_size,
-                     size_t num_files,
-                     Mode mode);
-
   bool OpenCurrentFile();
   void CloseCurrentFile();
 
@@ -108,7 +100,6 @@ class FileRotatingStream : public StreamInterface {
 
   const std::string dir_path_;
   const std::string file_prefix_;
-  const Mode mode_;
 
   // FileStream is used to write to the current file.
   std::unique_ptr<FileStream> file_stream_;
@@ -143,9 +134,6 @@ class FileRotatingStream : public StreamInterface {
 // Open() must be called before using this stream.
 class CallSessionFileRotatingStream : public FileRotatingStream {
  public:
-  // Use this constructor for reading a directory previously written to with
-  // this stream.
-  explicit CallSessionFileRotatingStream(const std::string& dir_path);
   // Use this constructor for writing to a directory. Files in the directory
   // matching what's used by the stream will be deleted. |max_total_log_size|
   // must be at least 4.