Delete unused method Win32Filesystem::GetAppPathname.

webrtc/base/win32filesystem.h

Index: webrtc/base/win32filesystem.h
diff --git a/webrtc/base/win32filesystem.h b/webrtc/base/win32filesystem.h
index 7ddbbd7e6c050ec80ff78b3009b2d66377a3909c..1a52d62fe61aabc72aea73e54d4a11eac0cf8a74 100644
--- a/webrtc/base/win32filesystem.h
+++ b/webrtc/base/win32filesystem.h
@@ -60,10 +60,6 @@ class Win32Filesystem : public FilesystemInterface {
   bool GetTemporaryFolder(Pathname& path,
                           bool create,
                           const std::string* append) override;
-
- private:
-  // Returns the path to the running application.
-  bool GetAppPathname(Pathname* path);
 };
 
 }  // namespace rtc