Remove CircularFileStream / replace it with CallSessionFileRotatingStream.

webrtc/base/filerotatingstream.h

 /*
  *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 32 matching lines @@
   StreamState GetState() const override;
   StreamResult Read(void* buffer,
                     size_t buffer_len,
                     size_t* read,
                     int* error) override;
   StreamResult Write(const void* data,
                      size_t data_len,
                      size_t* written,
                      int* error) override;
   bool Flush() override;
+  // Returns the total file size currently used on disk.
+  bool GetSize(size_t* size) const override;
   void Close() override;
 
   // Opens the appropriate file(s). Call this before using the stream.
   bool Open();
 
   // Disabling buffering causes writes to block until disk is updated. This is
   // enabled by default for performance.
   bool DisableBuffering();
 
   // Returns the path used for the i-th newest file, where the 0th file is the
@@ skipping 98 matching lines @@
 
   const size_t max_total_log_size_;
   size_t num_rotations_;
 
   DISALLOW_COPY_AND_ASSIGN(CallSessionFileRotatingStream);
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_FILEROTATINGSTREAM_H_