Fix the logic that limits the number of frames in a page.

Source/core/dom/NodeRareData.h

Index: Source/core/dom/NodeRareData.h
diff --git a/Source/core/dom/NodeRareData.h b/Source/core/dom/NodeRareData.h
index f19088c088dc674027f483e475ac0af74691f79b..8aad64ffd2fd000ffa36e10efb8ebe0ee32be30c 100644
--- a/Source/core/dom/NodeRareData.h
+++ b/Source/core/dom/NodeRareData.h
@@ -84,6 +84,7 @@ public:
     unsigned connectedSubframeCount() const { return m_connectedFrameCount; }
     void incrementConnectedSubframeCount(unsigned amount)
     {
+        RELEASE_ASSERT_WITH_SECURITY_IMPLICATION((m_connectedFrameCount + amount) < (1 << ConnectedFrameCountBits));

[dcheng, 2015/06/10 22:08:05]

Would it make sense to use maxNumberOfFrames here too?

[Nate Chapin, 2015/06/10 22:13:47]

I don't feel strongly, though this impl would need to move to the .cpp, so we
don't include FrameHost.h here unnecessarily.

         m_connectedFrameCount += amount;
     }
     void decrementConnectedSubframeCount(unsigned amount)