diff --git a/rtc_base/fileutils.h b/rtc_base/fileutils.h
index 6f20a20313..b9e8a05df7 100644
--- a/rtc_base/fileutils.h
+++ b/rtc_base/fileutils.h
@@ -96,9 +96,6 @@ class FilesystemInterface {
   // Returns true if pathname refers to a file
   virtual bool IsFile(const Pathname& pathname) = 0;
 
-  virtual std::string TempFilename(const Pathname &dir,
-                                   const std::string &prefix) = 0;
-
   // Determines the size of the file indicated by path.
   virtual bool GetFileSize(const Pathname& path, size_t* size) = 0;
 };
@@ -137,11 +134,6 @@ class Filesystem {
     return EnsureDefaultFilesystem()->IsFile(pathname);
   }
 
-  static std::string TempFilename(const Pathname &dir,
-                                  const std::string &prefix) {
-    return EnsureDefaultFilesystem()->TempFilename(dir, prefix);
-  }
-
   static bool GetFileSize(const Pathname& path, size_t* size) {
     return EnsureDefaultFilesystem()->GetFileSize(path, size);
   }
diff --git a/rtc_base/unixfilesystem.cc b/rtc_base/unixfilesystem.cc
index 8732d477a3..a48aca1a33 100644
--- a/rtc_base/unixfilesystem.cc
+++ b/rtc_base/unixfilesystem.cc
@@ -67,22 +67,6 @@ bool UnixFilesystem::DeleteFile(const Pathname &filename) {
   return ::unlink(filename.pathname().c_str()) == 0;
 }
 
-std::string UnixFilesystem::TempFilename(const Pathname &dir,
-                                         const std::string &prefix) {
-  int len = dir.pathname().size() + prefix.size() + 2 + 6;
-  char *tempname = new char[len];
-
-  snprintf(tempname, len, "%s/%sXXXXXX", dir.pathname().c_str(),
-           prefix.c_str());
-  int fd = ::mkstemp(tempname);
-  if (fd != -1)
-    ::close(fd);
-  std::string ret(tempname);
-  delete[] tempname;
-
-  return ret;
-}
-
 bool UnixFilesystem::MoveFile(const Pathname &old_path,
                               const Pathname &new_path) {
   if (!IsFile(old_path)) {
@@ -119,18 +103,6 @@ bool UnixFilesystem::GetFileSize(const Pathname& pathname, size_t *size) {
   return true;
 }
 
-char* UnixFilesystem::CopyString(const std::string& str) {
-  size_t size = str.length() + 1;
-
-  char* buf = new char[size];
-  if (!buf) {
-    return nullptr;
-  }
-
-  strcpyn(buf, size, str.c_str());
-  return buf;
-}
-
 }  // namespace rtc
 
 #if defined(__native_client__)
diff --git a/rtc_base/unixfilesystem.h b/rtc_base/unixfilesystem.h
index 27966f3aec..711d7b3ea1 100644
--- a/rtc_base/unixfilesystem.h
+++ b/rtc_base/unixfilesystem.h
@@ -37,20 +37,7 @@ class UnixFilesystem : public FilesystemInterface {
   // Returns true of pathname represents an existing file
   bool IsFile(const Pathname& pathname) override;
 
-  std::string TempFilename(const Pathname& dir,
-                           const std::string& prefix) override;
-
   bool GetFileSize(const Pathname& path, size_t* size) override;
-
- private:
-#if defined(WEBRTC_ANDROID) || defined(WEBRTC_MAC)
-  static char* provided_app_data_folder_;
-  static char* provided_app_temp_folder_;
-#else
-  static char* app_temp_path_;
-#endif
-
-  static char* CopyString(const std::string& str);
 };
 
 }  // namespace rtc
diff --git a/rtc_base/win32filesystem.cc b/rtc_base/win32filesystem.cc
index 511f9664e7..8ca84c34bb 100644
--- a/rtc_base/win32filesystem.cc
+++ b/rtc_base/win32filesystem.cc
@@ -42,16 +42,6 @@ bool Win32Filesystem::DeleteFile(const Pathname &filename) {
   return ::DeleteFile(ToUtf16(filename.pathname()).c_str()) != 0;
 }
 
-std::string Win32Filesystem::TempFilename(const Pathname &dir,
-                                          const std::string &prefix) {
-  wchar_t filename[MAX_PATH];
-  if (::GetTempFileName(ToUtf16(dir.pathname()).c_str(),
-                        ToUtf16(prefix).c_str(), 0, filename) != 0)
-    return ToUtf8(filename);
-  RTC_NOTREACHED();
-  return "";
-}
-
 bool Win32Filesystem::MoveFile(const Pathname &old_path,
                                const Pathname &new_path) {
   if (!IsFile(old_path)) {
diff --git a/rtc_base/win32filesystem.h b/rtc_base/win32filesystem.h
index e65d127cb2..d26741e67b 100644
--- a/rtc_base/win32filesystem.h
+++ b/rtc_base/win32filesystem.h
@@ -33,14 +33,6 @@ class Win32Filesystem : public FilesystemInterface {
   // Returns true if a file exists at path
   bool IsFile(const Pathname& path) override;
 
-  // All of the following functions set pathname and return true if successful.
-  // Returned paths always include a trailing backslash.
-  // If create is true, the path will be recursively created.
-  // If append is non-null, it will be appended (and possibly created).
-
-  std::string TempFilename(const Pathname& dir,
-                           const std::string& prefix) override;
-
   bool GetFileSize(const Pathname& path, size_t* size) override;
 };