Remove WorkerBackingThread::scriptCount

third_party/WebKit/Source/core/workers/WorkerBackingThread.h

Index: third_party/WebKit/Source/core/workers/WorkerBackingThread.h
diff --git a/third_party/WebKit/Source/core/workers/WorkerBackingThread.h b/third_party/WebKit/Source/core/workers/WorkerBackingThread.h
index afbc4a0509ac1bdcb64a2d2d4975bd60f1734183..3895867064b04b7f498ad5f0bde168e433827cbd 100644
--- a/third_party/WebKit/Source/core/workers/WorkerBackingThread.h
+++ b/third_party/WebKit/Source/core/workers/WorkerBackingThread.h
@@ -18,8 +18,8 @@ class WebThread;
 class WebThreadSupportingGC;
 
 // WorkerBackingThread represents a WebThread with Oilpan and V8 potentially
-// shared by multiple WebWorker scripts. A WebWorker needs to call attach() when
-// attaching itself to the backing thread, and call detach() when the script
+// shared by multiple WebWorker scripts. A WebWorker needs to call initialize()
+// to using V8 and Oilpan functionalities, and call detach() when the script
 // no longer needs the thread.
 // A WorkerBackingThread represents a WebThread while a WorkerThread corresponds
 // to a web worker. There is one-to-one correspondence between WorkerThread and
@@ -37,21 +37,12 @@ public:
 
     ~WorkerBackingThread();
 
-    // attach() and detach() attaches and detaches Oilpan and V8 to / from
-    // the caller worker script, respectively. attach() and detach() increments
-    // and decrements m_workerScriptCount. attach() initializes Oilpan and V8
-    // when m_workerScriptCount is 0. detach() terminates Oilpan and V8 when
-    // m_workerScriptCount is 1. A worker script must not call any function
-    // after calling detach().
+    // initialize() and shutdown() attaches and detaches Oilpan and V8 to / from
+    // the caller worker script, respectively. A worker script must not call
+    // any function after calling shutdown().
     // They should be called from |this| thread.
-    void attach();
-    void detach();
-
-    unsigned workerScriptCount()
-    {
-        MutexLocker locker(m_mutex);
-        return m_workerScriptCount;
-    }
+    void initialize();
+    void shutdown();
 
     WebThreadSupportingGC& backingThread()
     {
@@ -67,14 +58,9 @@ public:
 private:
     WorkerBackingThread(const char* name, bool shouldCallGCOnShutdown);
     WorkerBackingThread(WebThread*, bool shouldCallGCOnSHutdown);
-    void initialize();
-    void shutdown();
 
-    // Protects |m_workerScriptCount|.
-    Mutex m_mutex;
     OwnPtr<WebThreadSupportingGC> m_backingThread;
     v8::Isolate* m_isolate = nullptr;
-    unsigned m_workerScriptCount = 0;
     bool m_isOwningThread;
     bool m_shouldCallGCOnShutdown;
 };