Oilpan: dispose an HTMLImportsController on document detach/removal.

Source/core/html/imports/HTMLImportTreeRoot.cpp

 // Copyright 2014 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 "config.h"
 #include "core/html/imports/HTMLImportTreeRoot.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/StyleEngine.h"
 #include "core/frame/LocalFrame.h"
@@ skipping 10 matching lines @@
     : HTMLImport(HTMLImport::Sync)
     , m_document(document)
     , m_recalcTimer(this, &HTMLImportTreeRoot::recalcTimerFired)
 {
     scheduleRecalcState(); // This recomputes initial state.
 }
 
 HTMLImportTreeRoot::~HTMLImportTreeRoot()
 {
 #if !ENABLE(OILPAN)
-    for (size_t i = 0; i < m_imports.size(); ++i)
-        m_imports[i]->importDestroyed();
-    m_imports.clear();
-    m_document = nullptr;
+    dispose();
 #endif
 }
 
+void HTMLImportTreeRoot::dispose()
+{
+    for (size_t i = 0; i < m_imports.size(); ++i)
+        m_imports[i]->dispose();
+    m_imports.clear();
+    m_document = nullptr;
+    m_recalcTimer.stop();
+}
+
 Document* HTMLImportTreeRoot::document() const
 {
     return m_document;
 }
 
 bool HTMLImportTreeRoot::isDone() const
 {
     return !m_document->parsing() && m_document->styleEngine().haveStylesheetsLoaded();
 }
 
@@ skipping 54 matching lines @@
 }
 
 DEFINE_TRACE(HTMLImportTreeRoot)
 {
     visitor->trace(m_document);
     visitor->trace(m_imports);
     HTMLImport::trace(visitor);
 }
 
 }