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

Source/core/rendering/RenderBlockLineLayout.cpp

Index: Source/core/rendering/RenderBlockLineLayout.cpp
diff --git a/Source/core/rendering/RenderBlockLineLayout.cpp b/Source/core/rendering/RenderBlockLineLayout.cpp
index e45d475b85a53643bf3442e3c967c8a7d9146084..41eadb7f564620b16d3b66640d1ce0de38d51567 100644
--- a/Source/core/rendering/RenderBlockLineLayout.cpp
+++ b/Source/core/rendering/RenderBlockLineLayout.cpp
@@ -256,7 +256,7 @@ RootInlineBox* RenderBlockFlow::constructLine(BidiRunList<BidiRun>& bidiRuns, co
         if (!box)
             continue;
 
-        if (!rootHasSelectedChildren && box->renderer()->selectionState() != RenderObject::SelectionNone)
+        if (!rootHasSelectedChildren && box->renderer().selectionState() != RenderObject::SelectionNone)
             rootHasSelectedChildren = true;
 
         // If we have no parent box yet, or if the run is not simply a sibling,
@@ -961,11 +961,11 @@ void RenderBlockFlow::layoutRunsAndFloats(LineLayoutState& layoutState)
         // adjust the height accordingly.
         // A line break can be either the first or the last object on a line, depending on its direction.
         if (InlineBox* lastLeafChild = lastRootBox()->lastLeafChild()) {
-            RenderObject* lastObject = lastLeafChild->renderer();
-            if (!lastObject->isBR())
+            RenderObject& lastObject = lastLeafChild->renderer();
+            if (!lastObject.isBR())
                 lastObject = lastRootBox()->firstLeafChild()->renderer();
-            if (lastObject->isBR()) {
-                EClear clear = lastObject->style()->clear();
+            if (lastObject.isBR()) {
+                EClear clear = lastObject.style()->clear();
                 if (clear != CNONE)
                     clearFloats(clear);
             }
@@ -1423,7 +1423,7 @@ void RenderBlockFlow::linkToEndLineIfNeeded(LineLayoutState& layoutState)
         if (layoutState.checkForFloatsFromLastLine()) {
             LayoutUnit bottomVisualOverflow = lastRootBox()->logicalBottomVisualOverflow();
             LayoutUnit bottomLayoutOverflow = lastRootBox()->logicalBottomLayoutOverflow();
-            TrailingFloatsRootInlineBox* trailingFloatsLineBox = new TrailingFloatsRootInlineBox(this);
+            TrailingFloatsRootInlineBox* trailingFloatsLineBox = new TrailingFloatsRootInlineBox(*this);
             m_lineBoxes.appendLineBox(trailingFloatsLineBox);
             trailingFloatsLineBox->setConstructed();
             GlyphOverflowAndFallbackFontsMap textBoxDataMap;