Delete FilesystemInterface::CopyFile.

webrtc/base/win32filesystem.h

Index: webrtc/base/win32filesystem.h
diff --git a/webrtc/base/win32filesystem.h b/webrtc/base/win32filesystem.h
index 3ceaa20b06a0f98edb7f12fcb7eb0b72887f17b5..9e61436422721269be228a76735097a723b5d674 100644
--- a/webrtc/base/win32filesystem.h
+++ b/webrtc/base/win32filesystem.h
@@ -41,10 +41,6 @@ class Win32Filesystem : public FilesystemInterface {
   // Returns true if the file is successfully moved
   virtual bool MoveFile(const Pathname &old_path, const Pathname &new_path);
   
-  // This copies a file from old_path to _new_path
-  // Returns true if function succeeds
-  virtual bool CopyFile(const Pathname &old_path, const Pathname &new_path);
-
   // Returns true if a pathname is a directory
   virtual bool IsFolder(const Pathname& pathname);