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

Source/core/rendering/RenderBlockFlow.cpp

Index: Source/core/rendering/RenderBlockFlow.cpp
diff --git a/Source/core/rendering/RenderBlockFlow.cpp b/Source/core/rendering/RenderBlockFlow.cpp
index 53135d4d80a8e3c61b1390a16348f3e9eea4bf64..d05eed6c0c8a586fdcc9c337b061c73bb561ae8b 100644
--- a/Source/core/rendering/RenderBlockFlow.cpp
+++ b/Source/core/rendering/RenderBlockFlow.cpp
@@ -858,7 +858,7 @@ void RenderBlockFlow::rebuildFloatsFromIntruding()
 
                     floatMap.remove(floatingObject->renderer());
                     if (oldFloatingObject->originatingLine() && !selfNeedsLayout()) {
-                        ASSERT(oldFloatingObject->originatingLine()->renderer() == this);
+                        ASSERT(&oldFloatingObject->originatingLine()->renderer() == this);
                         oldFloatingObject->originatingLine()->markDirty();
                     }
                     delete oldFloatingObject;
@@ -2290,7 +2290,7 @@ void RenderBlockFlow::removeFloatingObject(RenderBox* floatBox)
                 }
                 if (floatingObject->originatingLine()) {
                     if (!selfNeedsLayout()) {
-                        ASSERT(floatingObject->originatingLine()->renderer() == this);
+                        ASSERT(&floatingObject->originatingLine()->renderer() == this);
                         floatingObject->originatingLine()->markDirty();
                     }
 #if !ASSERT_DISABLED
@@ -2810,7 +2810,7 @@ TextRun RenderBlockFlow::constructTextRun(RenderObject* context, const Font& fon
 
 RootInlineBox* RenderBlockFlow::createRootInlineBox()
 {
-    return new RootInlineBox(this);
+    return new RootInlineBox(*this);
 }
 
 void RenderBlockFlow::createMultiColumnFlowThreadIfNeeded()