Remove separate thread for the shell on Android.

mojo/shell/task_runners.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_SHELL_TASK_RUNNERS_H_
 #define MOJO_SHELL_TASK_RUNNERS_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/threading/thread.h"
@@ skipping 16 matching lines @@
   }
 
   base::SingleThreadTaskRunner* file_runner() const {
     return file_thread_->message_loop_proxy();
   }
 
   base::MessageLoopProxy* cache_runner() const {
     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);
 };
 
 }  // namespace shell
 }  // namespace mojo
 
 #endif  // MOJO_SHELL_TASK_RUNNERS_H_