Make nesting/running states a RunLoop rather than a MessageLoop concept.

storage/browser/fileapi/file_system_operation_impl_write_unittest.cc

 // 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.
 
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
 #include <vector>
 
@@ skipping 121 matching lines @@
   void DidWrite(base::File::Error status, int64_t bytes, bool complete) {
     if (status == base::File::FILE_OK) {
       add_bytes_written(bytes, complete);
       if (complete)
         base::MessageLoop::current()->QuitWhenIdle();
     } else {
       EXPECT_FALSE(complete_);
       EXPECT_EQ(status_, base::File::FILE_OK);
       complete_ = true;
       status_ = status;
-      if (base::MessageLoop::current()->is_running())
+      if (base::RunLoop::IsRunningOnCurrentThread())
         base::MessageLoop::current()->QuitWhenIdle();
     }
   }
 
   void DidCancel(base::File::Error status) { cancel_status_ = status; }
 
   const MockBlobURLRequestContext& url_request_context() const {
     return *url_request_context_;
   }
 
@@ skipping 162 matching lines @@
   EXPECT_EQ(base::File::FILE_ERROR_ABORT, status());
   EXPECT_EQ(base::File::FILE_OK, cancel_status());
   EXPECT_TRUE(complete());
 
   EXPECT_EQ(0, change_observer()->get_and_reset_modify_file_count());
 }
 
 // TODO(ericu,dmikurube,kinuko): Add more tests for cancel cases.
 
 }  // namespace content