Make InlineBox::renderer() and related subclass methods return reference.

Source/core/rendering/FloatingObjects.cpp

Index: Source/core/rendering/FloatingObjects.cpp
diff --git a/Source/core/rendering/FloatingObjects.cpp b/Source/core/rendering/FloatingObjects.cpp
index 7f202d372a3254d36e567652d38d75266230c286..a4f2396892f6dc65440d3dc1b099d9164454134f 100644
--- a/Source/core/rendering/FloatingObjects.cpp
+++ b/Source/core/rendering/FloatingObjects.cpp
@@ -141,7 +141,7 @@ void FloatingObjects::clearLineBoxTreePointers()
     // Clear references to originating lines, since the lines are being deleted
     FloatingObjectSetIterator end = m_set.end();
     for (FloatingObjectSetIterator it = m_set.begin(); it != end; ++it) {
-        ASSERT(!((*it)->originatingLine()) || (*it)->originatingLine()->renderer() == m_renderer);
+        ASSERT(!((*it)->originatingLine()) || &(*it)->originatingLine()->renderer() == m_renderer);
         (*it)->setOriginatingLine(0);
     }
 }