Make HTMLImportTreeNode own the whole import tree.

Source/core/html/imports/HTMLImportTreeRoot.cpp

Index: Source/core/html/imports/HTMLImportTreeRoot.cpp
diff --git a/Source/core/html/imports/HTMLImportTreeRoot.cpp b/Source/core/html/imports/HTMLImportTreeRoot.cpp
index d44d93291be97f173f54b87f1c95423d30bae3a6..4cdf4692d100b9c5dba0edf6d07815fa8425b0f9 100644
--- a/Source/core/html/imports/HTMLImportTreeRoot.cpp
+++ b/Source/core/html/imports/HTMLImportTreeRoot.cpp
@@ -8,6 +8,7 @@
 #include "core/dom/Document.h"
 #include "core/dom/StyleEngine.h"
 #include "core/frame/LocalFrame.h"
+#include "core/html/imports/HTMLImportChild.h"
 
 namespace WebCore {
 
@@ -24,6 +25,13 @@ HTMLImportTreeRoot::HTMLImportTreeRoot(Document* document)
     recalcTreeState(this); // This recomputes initial state.
 }
 
+HTMLImportTreeRoot::~HTMLImportTreeRoot()
+{
+    for (size_t i = 0; i < m_imports.size(); ++i)
+        m_imports[i]->importDestroyed();
+    m_imports.clear();
+}
+
 Document* HTMLImportTreeRoot::document() const
 {
     return m_document;
@@ -56,6 +64,23 @@ void HTMLImportTreeRoot::scheduleRecalcState()
     m_recalcTimer.startOneShot(0, FROM_HERE);
 }
 
+HTMLImportChild* HTMLImportTreeRoot::keep(PassOwnPtr<HTMLImportChild> child)
+{
+    m_imports.append(child);
+    return m_imports.last().get();
+}
+
+HTMLImportChild* HTMLImportTreeRoot::find(const KURL& url) const
+{
+    for (size_t i = 0; i < m_imports.size(); ++i) {
+        HTMLImportChild* candidate = m_imports[i].get();
+        if (equalIgnoringFragmentIdentifier(candidate->url(), url))
+            return candidate;
+    }
+
+    return 0;
+}
+
 void HTMLImportTreeRoot::recalcTimerFired(Timer<HTMLImportTreeRoot>*)
 {
     ASSERT(m_document);