content/child: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

components/tracing/child_trace_message_filter.cc

Index: components/tracing/child_trace_message_filter.cc
diff --git a/components/tracing/child_trace_message_filter.cc b/components/tracing/child_trace_message_filter.cc
index 3dd1223d643140e67ec30bb63695cd464107d134..194f0972e0328390927304522f2fe91a933ecb3d 100644
--- a/components/tracing/child_trace_message_filter.cc
+++ b/components/tracing/child_trace_message_filter.cc
@@ -15,9 +15,9 @@ using base::trace_event::TraceLog;
 namespace tracing {
 
 ChildTraceMessageFilter::ChildTraceMessageFilter(
-    base::MessageLoopProxy* ipc_message_loop)
+    base::SingleThreadTaskRunner* ipc_task_runner)
     : sender_(NULL),
-      ipc_message_loop_(ipc_message_loop),
+      ipc_task_runner_(ipc_task_runner),
       pending_memory_dump_guid_(0) {
 }
 
@@ -132,8 +132,9 @@ void ChildTraceMessageFilter::OnCancelWatchEvent() {
 }
 
 void ChildTraceMessageFilter::OnWatchEventMatched() {
-  if (!ipc_message_loop_->BelongsToCurrentThread()) {
-    ipc_message_loop_->PostTask(FROM_HERE,
+  if (!ipc_task_runner_->BelongsToCurrentThread()) {
+    ipc_task_runner_->PostTask(
+        FROM_HERE,
         base::Bind(&ChildTraceMessageFilter::OnWatchEventMatched, this));
     return;
   }
@@ -143,10 +144,10 @@ void ChildTraceMessageFilter::OnWatchEventMatched() {
 void ChildTraceMessageFilter::OnTraceDataCollected(
     const scoped_refptr<base::RefCountedString>& events_str_ptr,
     bool has_more_events) {
-  if (!ipc_message_loop_->BelongsToCurrentThread()) {
-    ipc_message_loop_->PostTask(FROM_HERE,
-        base::Bind(&ChildTraceMessageFilter::OnTraceDataCollected, this,
-                   events_str_ptr, has_more_events));
+  if (!ipc_task_runner_->BelongsToCurrentThread()) {
+    ipc_task_runner_->PostTask(
+        FROM_HERE, base::Bind(&ChildTraceMessageFilter::OnTraceDataCollected,
+                              this, events_str_ptr, has_more_events));
     return;
   }
   if (events_str_ptr->data().size()) {
@@ -163,13 +164,11 @@ void ChildTraceMessageFilter::OnTraceDataCollected(
 void ChildTraceMessageFilter::OnMonitoringTraceDataCollected(
      const scoped_refptr<base::RefCountedString>& events_str_ptr,
      bool has_more_events) {
-  if (!ipc_message_loop_->BelongsToCurrentThread()) {
-    ipc_message_loop_->PostTask(FROM_HERE,
-        base::Bind(&ChildTraceMessageFilter::
-                   OnMonitoringTraceDataCollected,
-                   this,
-                   events_str_ptr,
-                   has_more_events));
+  if (!ipc_task_runner_->BelongsToCurrentThread()) {
+    ipc_task_runner_->PostTask(
+        FROM_HERE,
+        base::Bind(&ChildTraceMessageFilter::OnMonitoringTraceDataCollected,
+                   this, events_str_ptr, has_more_events));
     return;
   }
   sender_->Send(new TracingHostMsg_MonitoringTraceDataCollected(