Execute operations of ChildProcessLauncher on launcher thread

content/browser/child_process_launcher.cc

Index: content/browser/child_process_launcher.cc
diff --git a/content/browser/child_process_launcher.cc b/content/browser/child_process_launcher.cc
index 55037881bb67a00ecf80440d802d4e93bdbb1631..6fd30ab1f09a99f22e4bcd042a99a46dca9854ac 100644
--- a/content/browser/child_process_launcher.cc
+++ b/content/browser/child_process_launcher.cc
@@ -70,18 +70,14 @@ void RecordHistogramsOnLauncherThread(base::TimeDelta launch_time) {
 }
 
 #if defined(OS_ANDROID)
-// TODO(sievers): Remove this by defining better what happens on what
-// thread in the corresponding Java code.
 void OnChildProcessStartedAndroid(const NotifyCallback& callback,
                                   BrowserThread::ID client_thread_id,
                                   const base::TimeTicks begin_launch_time,
                                   base::ScopedFD ipcfd,
                                   base::ProcessHandle handle) {
-  // This can be called on the launcher thread or UI thread.
+  // This will be called on the launcher thread.
   base::TimeDelta launch_time = base::TimeTicks::Now() - begin_launch_time;
-  BrowserThread::PostTask(
-      BrowserThread::PROCESS_LAUNCHER, FROM_HERE,
-      base::Bind(&RecordHistogramsOnLauncherThread, launch_time));
+  RecordHistogramsOnLauncherThread(launch_time);
 
   base::Closure callback_on_client_thread(
       base::Bind(callback, false, base::Passed(&ipcfd),