Do not fire didStartLoading and didStopLoading events twice.

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index ff8de6407bb41b0f7bc41229f1799f4e54f9e066..d5929525edef64a4c34996460c234b4cafac7b32 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -911,6 +911,7 @@ public:
     bool loadEventFinished() const { return m_loadEventProgress >= LoadEventCompleted; }
     bool unloadStarted() const { return m_loadEventProgress >= PageHideInProgress; }
     bool processingBeforeUnload() const { return m_loadEventProgress == BeforeUnloadEventInProgress; }
+    bool shouldFireLoadingEvents() const { return m_loadEventProgress == LoadEventCompleted; }

[Nate Chapin, 2015/03/06 18:22:20]

This name seems overly specific to its usage. isNotLoadingOrUnloading?
completeButNotUnloading? inStableLoadingState?

[Fabrice (no longer in Chrome), 2015/03/06 18:39:13]

I kinda like it because it's only really supposed to be used for that.
Anyway, I changed it to isLoadEventCompleted.

     void suppressLoadEvent();
 
     void setContainsPlugins() { m_containsPlugins = true; }