Refactor the Heap into ThreadHeap to prepare for per thread heaps

third_party/WebKit/Source/modules/webdatabase/DatabaseTask.h

Index: third_party/WebKit/Source/modules/webdatabase/DatabaseTask.h
diff --git a/third_party/WebKit/Source/modules/webdatabase/DatabaseTask.h b/third_party/WebKit/Source/modules/webdatabase/DatabaseTask.h
index b1760161cd343e62f215aa9023209313f3b4ca2c..947428b325e376d7ad0340240f09e1c8dee4055f 100644
--- a/third_party/WebKit/Source/modules/webdatabase/DatabaseTask.h
+++ b/third_party/WebKit/Source/modules/webdatabase/DatabaseTask.h
@@ -44,6 +44,7 @@
 
 namespace blink {
 
+// DatabaseTask can be created from main thread and database thread.

[haraken, 2016/01/07 08:06:21]

from main thread => by the main thread

 class DatabaseTask {
     WTF_MAKE_NONCOPYABLE(DatabaseTask); USING_FAST_MALLOC(DatabaseTask);
 public:
@@ -63,7 +64,7 @@ private:
     virtual void doPerformTask() = 0;
     virtual void taskCancelled() { }
 
-    CrossThreadPersistent<Database> m_database;
+    XThreadPersistent<Database> m_database;
     TaskSynchronizer* m_synchronizer;
 
 #if !LOG_DISABLED
@@ -130,7 +131,7 @@ private:
     const char* debugTaskName() const override;
 #endif
 
-    CrossThreadPersistent<SQLTransactionBackend> m_transaction;
+    XThreadPersistent<SQLTransactionBackend> m_transaction;
 };
 
 class Database::DatabaseTableNamesTask final : public DatabaseTask {