Remove calls to deprecated MessageLoop methods from mojo/.

mojo/android/system/base_run_loop.cc

Index: mojo/android/system/base_run_loop.cc
diff --git a/mojo/android/system/base_run_loop.cc b/mojo/android/system/base_run_loop.cc
index 8768d2f7e29dd562ea5c0d0cf672ca07226c40bf..8471195f0616ba3b0004d354034a81064a81201e 100644
--- a/mojo/android/system/base_run_loop.cc
+++ b/mojo/android/system/base_run_loop.cc
@@ -10,7 +10,10 @@
 #include "base/android/jni_android.h"
 #include "base/android/jni_registrar.h"
 #include "base/bind.h"
+#include "base/logging.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "jni/BaseRunLoop_jni.h"
 
 using base::android::JavaParamRef;
@@ -27,13 +30,19 @@ static jlong CreateBaseRunLoop(JNIEnv* env,
 static void Run(JNIEnv* env,
                 const JavaParamRef<jobject>& jcaller,
                 jlong runLoopID) {
-  reinterpret_cast<base::MessageLoop*>(runLoopID)->Run();
+  DCHECK(reinterpret_cast<base::MessageLoop*>(runLoopID)
+             ->task_runner()
+             ->BelongsToCurrentThread());

[jam, 2016/08/30 16:33:04]

if try runs passed (which I can't tell, since you didn't run this through
trybots yet), then this parameter is not needed and it should just be removed
from these moethods.

+  base::RunLoop().Run();
 }
 
 static void RunUntilIdle(JNIEnv* env,
                          const JavaParamRef<jobject>& jcaller,
                          jlong runLoopID) {
-  reinterpret_cast<base::MessageLoop*>(runLoopID)->RunUntilIdle();
+  DCHECK(reinterpret_cast<base::MessageLoop*>(runLoopID)
+             ->task_runner()
+             ->BelongsToCurrentThread());
+  base::RunLoop().RunUntilIdle();
 }
 
 static void Quit(JNIEnv* env,
@@ -58,9 +67,10 @@ static void PostDelayedTask(JNIEnv* env,
   // use it across threads. |RunJavaRunnable| will acquire a new JNIEnv before
   // running the Runnable.
   runnable_ref.Reset(env, runnable);
-  reinterpret_cast<base::MessageLoop*>(runLoopID)->PostDelayedTask(
-      FROM_HERE, base::Bind(&RunJavaRunnable, runnable_ref),
-      base::TimeDelta::FromMicroseconds(delay));
+  reinterpret_cast<base::MessageLoop*>(runLoopID)
+      ->task_runner()
+      ->PostDelayedTask(FROM_HERE, base::Bind(&RunJavaRunnable, runnable_ref),
+                        base::TimeDelta::FromMicroseconds(delay));
 }
 
 static void DeleteMessageLoop(JNIEnv* env,