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

content/renderer/devtools/devtools_agent_filter.cc

Index: content/renderer/devtools/devtools_agent_filter.cc
diff --git a/content/renderer/devtools/devtools_agent_filter.cc b/content/renderer/devtools/devtools_agent_filter.cc
index f84b56da2e134676043fab2046a51af716033a09..1e015f7910ffdd17045d4c4dece74b0462e19a84 100644
--- a/content/renderer/devtools/devtools_agent_filter.cc
+++ b/content/renderer/devtools/devtools_agent_filter.cc
@@ -5,6 +5,7 @@
 #include "content/renderer/devtools/devtools_agent_filter.h"
 
 #include "base/bind.h"
+#include "base/message_loop/message_loop.h"
 #include "content/child/child_process.h"
 #include "content/common/devtools_messages.h"
 #include "content/renderer/devtools/devtools_agent.h"
@@ -47,8 +48,10 @@
 }  // namespace
 
 DevToolsAgentFilter::DevToolsAgentFilter()
-    : io_task_runner_(ChildProcess::current()->io_task_runner()),
-      current_routing_id_(0) {}
+    : render_thread_loop_(base::MessageLoop::current()),
+      io_task_runner_(ChildProcess::current()->io_task_runner()),
+      current_routing_id_(0) {
+}
 
 bool DevToolsAgentFilter::OnMessageReceived(const IPC::Message& message) {
   // Dispatch debugger commands directly from IO.