Build browser_process_sub_thread.cc on iOS.

content/browser/browser_process_sub_thread.cc

Index: content/browser/browser_process_sub_thread.cc
diff --git a/content/browser/browser_process_sub_thread.cc b/content/browser/browser_process_sub_thread.cc
index 942ecd978c0a865ff9833e40039098bf24007cb5..9a5b78a9edb0096cf39c4b9160294ba85379b82e 100644
--- a/content/browser/browser_process_sub_thread.cc
+++ b/content/browser/browser_process_sub_thread.cc
@@ -64,10 +64,12 @@ void BrowserProcessSubThread::IOThreadPreCleanUp() {
   // Destroy all URLRequests started by URLFetchers.
   net::URLFetcher::CancelAll();
 
+#if !defined(OS_IOS)
   // If any child processes are still running, terminate them and
   // and delete the BrowserChildProcessHost instances to release whatever
   // IO thread only resources they are referencing.
   BrowserChildProcessHostImpl::TerminateAll();
+#endif  // !defined(OS_IOS)
 }
 
 }  // namespace content