Remove separate thread for the shell on Android.

mojo/shell/task_runners.h

Index: mojo/shell/task_runners.h
diff --git a/mojo/shell/task_runners.h b/mojo/shell/task_runners.h
index 509c5ae8df3009d79228eb2446110301687c96f8..7311cad21acb5c9aa7fbe57474e31d3a5342e6fe 100644
--- a/mojo/shell/task_runners.h
+++ b/mojo/shell/task_runners.h
@@ -34,26 +34,13 @@ class TaskRunners {
     return cache_thread_->message_loop_proxy();
   }
 
-#if defined(OS_ANDROID)
-  void set_java_runner(base::SingleThreadTaskRunner* java_runner) {
-    java_runner_ = java_runner;
-  }
-
-  base::SingleThreadTaskRunner* java_runner() const {
-    return java_runner_.get();
-  }
-#endif // defined(OS_ANDROID)
-
  private:
+  // TODO(beng): should this be named shell_runner_?
   scoped_refptr<base::SingleThreadTaskRunner> ui_runner_;
   scoped_ptr<base::Thread> cache_thread_;
   scoped_ptr<base::Thread> io_thread_;
   scoped_ptr<base::Thread> file_thread_;
 
-#if defined(OS_ANDROID)
-  scoped_refptr<base::SingleThreadTaskRunner> java_runner_;
-#endif // defined(OS_ANDROID)
-
   DISALLOW_COPY_AND_ASSIGN(TaskRunners);
 };