Refactor the Heap into ThreadHeap to prepare for per thread heaps

third_party/WebKit/Source/modules/webdatabase/SQLStatement.cpp

 /*
  * Copyright (C) 2007, 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 37 matching lines @@
 {
     return new SQLStatement(database, callback, errorCallback);
 }
 
 SQLStatement::SQLStatement(Database* database, SQLStatementCallback* callback,
     SQLStatementErrorCallback* errorCallback)
     : m_statementCallback(callback)
     , m_statementErrorCallback(errorCallback)
     , m_asyncOperationId(0)
 {
+    ASSERT(isMainThread());
     if (hasCallback() || hasErrorCallback())
         m_asyncOperationId = InspectorInstrumentation::traceAsyncOperationStarting(database->executionContext(), "SQLStatement");
 }
 
 SQLStatement::~SQLStatement()
 {
 }
 
 DEFINE_TRACE(SQLStatement)
 {
@@ skipping 38 matching lines @@
     } else if (callback) {
         callbackError = !callback->handleEvent(transaction, m_backend->sqlResultSet());
     }
 
     InspectorInstrumentation::traceAsyncCallbackCompleted(cookie);
 
     return callbackError;
 }
 
 } // namespace blink