Remove parallel marking support.

src/marking-thread.h

Index: src/marking-thread.h
diff --git a/src/marking-thread.h b/src/marking-thread.h
deleted file mode 100644
index 021cd5b48c78dde7ee13be890ceff08c387db51a..0000000000000000000000000000000000000000
--- a/src/marking-thread.h
+++ /dev/null
@@ -1,66 +0,0 @@
-// Copyright 2013 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_MARKING_THREAD_H_
-#define V8_MARKING_THREAD_H_
-
-#include "atomicops.h"
-#include "flags.h"
-#include "platform.h"
-#include "v8utils.h"
-
-#include "spaces.h"
-
-#include "heap.h"
-
-namespace v8 {
-namespace internal {
-
-class MarkingThread : public Thread {
- public:
-  explicit MarkingThread(Isolate* isolate);
-  ~MarkingThread() {}
-
-  void Run();
-  void Stop();
-  void StartMarking();
-  void WaitForMarkingThread();
-
- private:
-  Isolate* isolate_;
-  Heap* heap_;
-  Semaphore start_marking_semaphore_;
-  Semaphore end_marking_semaphore_;
-  Semaphore stop_semaphore_;
-  volatile AtomicWord stop_thread_;
-  int id_;
-  static Atomic32 id_counter_;
-};
-
-} }  // namespace v8::internal
-
-#endif  // V8_MARKING_THREAD_H_