Remove calls to MessageLoop::current() in content.

content/ppapi_plugin/ppapi_thread.cc

Index: content/ppapi_plugin/ppapi_thread.cc
diff --git a/content/ppapi_plugin/ppapi_thread.cc b/content/ppapi_plugin/ppapi_thread.cc
index ea5e4bc341e1bb6fa2524a3f7a1e4f85b2c32f2c..a32122dbfb6b779fc7a540ee6955488e57abb63c 100644
--- a/content/ppapi_plugin/ppapi_thread.cc
+++ b/content/ppapi_plugin/ppapi_thread.cc
@@ -18,6 +18,7 @@
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/rand_util.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/platform_thread.h"
@@ -149,7 +150,7 @@ void PpapiThread::Shutdown() {
 
 bool PpapiThread::Send(IPC::Message* msg) {
   // Allow access from multiple threads.
-  if (base::MessageLoop::current() == message_loop())
+  if (message_loop()->task_runner()->BelongsToCurrentThread())
     return ChildThreadImpl::Send(msg);
 
   return sync_message_filter()->Send(msg);