Remove DownloadProcessService code path

content/browser/android/child_process_launcher_android.h

Index: content/browser/android/child_process_launcher_android.h
diff --git a/content/browser/android/child_process_launcher_android.h b/content/browser/android/child_process_launcher_android.h
index 5e9d11910a22eb2b2901706092f7978cc841db17..f97e5a9fa1e5f152eec4f66e40356be129e03c37 100644
--- a/content/browser/android/child_process_launcher_android.h
+++ b/content/browser/android/child_process_launcher_android.h
@@ -32,10 +32,6 @@ void StartChildProcess(
     const std::map<int, base::MemoryMappedFile::Region>& regions,
     const StartChildProcessCallback& callback);
 
-// Starts the background download process if it hasn't been started.
-// TODO(qinmin): pass the download parameters here and pass it to java side.
-void StartDownloadProcessIfNecessary();
-
 // Stops a child process based on the handle returned form
 // StartChildProcess.
 void StopChildProcess(base::ProcessHandle handle);