Remove calls to deprecated MessageLoop methods in content.

content/app/android/download_main.cc

Index: content/app/android/download_main.cc
diff --git a/content/app/android/download_main.cc b/content/app/android/download_main.cc
index 3280e29a3cca159a5ad5ca7a70b0211998b41674..fa759337c2ca32494a63f6ab2be51f87e8375b7b 100644
--- a/content/app/android/download_main.cc
+++ b/content/app/android/download_main.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "base/threading/platform_thread.h"
 #include "content/public/common/main_function_params.h"
 
@@ -13,7 +14,7 @@ int DownloadMain(const MainFunctionParams& parameters) {
   // The main message loop of the utility process.
   base::MessageLoop main_message_loop;
   base::PlatformThread::SetName("CrDownloadMain");
-  base::MessageLoop::current()->Run();
+  base::RunLoop().Run();
 
   return 0;
 }