[Test] have the provisional DocumentLoader protect itself

third_party/WebKit/Source/core/loader/DocumentLoader.cpp

Index: third_party/WebKit/Source/core/loader/DocumentLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
index d76d6e3208fb1cff218d29d6ee93b32c84f43535..ac01670abf4ef84b1aa11ad5f4b9182ca04d1875 100644
--- a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
@@ -93,6 +93,7 @@ DocumentLoader::DocumentLoader(LocalFrame* frame, const ResourceRequest& req, co
     , m_navigationType(NavigationTypeOther)
     , m_documentLoadTiming(*this)
     , m_timeOfLastDataReceived(0.0)
+    , m_shouldProtect(false)
     , m_applicationCacheHost(ApplicationCacheHost::create(this))
     , m_state(NotStarted)
     , m_inDataReceived(false)
@@ -242,6 +243,8 @@ void DocumentLoader::mainReceivedError(const ResourceError& error)
 // but not loads initiated by child frames' data sources -- that's the WebFrame's job.
 void DocumentLoader::stopLoading()
 {
+    if (m_shouldProtect)
+        return;
     RefPtrWillBeRawPtr<LocalFrame> protectFrame(m_frame.get());
     RefPtrWillBeRawPtr<DocumentLoader> protectLoader(this);
 
@@ -573,6 +576,8 @@ bool DocumentLoader::loadingMultipartContent() const
 
 void DocumentLoader::detachFromFrame()
 {
+    if (m_shouldProtect)
+        return;
     ASSERT(m_frame);
     RefPtrWillBeRawPtr<LocalFrame> protectFrame(m_frame.get());
     RefPtrWillBeRawPtr<DocumentLoader> protectLoader(this);