chrome/browser: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

chrome/browser/process_singleton_posix.cc

Index: chrome/browser/process_singleton_posix.cc
diff --git a/chrome/browser/process_singleton_posix.cc b/chrome/browser/process_singleton_posix.cc
index 28946f4f2322c1347ed16b515262ee98ea30e514..6ccc2659d75ee8079721fa21477e4c8b1d943733 100644
--- a/chrome/browser/process_singleton_posix.cc
+++ b/chrome/browser/process_singleton_posix.cc
@@ -58,6 +58,7 @@
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
+#include "base/location.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
@@ -65,6 +66,7 @@
 #include "base/posix/safe_strerror.h"
 #include "base/rand_util.h"
 #include "base/sequenced_task_runner_helpers.h"
+#include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
@@ -702,12 +704,9 @@ void ProcessSingleton::LinuxWatcher::SocketReader::OnFileCanReadWithoutBlocking(
   tokens.erase(tokens.begin());
 
   // Return to the UI thread to handle opening a new browser tab.
-  ui_message_loop_->PostTask(FROM_HERE, base::Bind(
-      &ProcessSingleton::LinuxWatcher::HandleMessage,
-      parent_,
-      current_dir,
-      tokens,
-      this));
+  ui_message_loop_->task_runner()->PostTask(
+      FROM_HERE, base::Bind(&ProcessSingleton::LinuxWatcher::HandleMessage,
+                            parent_, current_dir, tokens, this));
   fd_reader_.StopWatchingFileDescriptor();
 
   // LinuxWatcher::HandleMessage() is in charge of destroying this SocketReader