add 'slow' prefix to RenderObject's firstChild() / lastChild() methods

Source/core/rendering/svg/RenderSVGText.cpp

Index: Source/core/rendering/svg/RenderSVGText.cpp
diff --git a/Source/core/rendering/svg/RenderSVGText.cpp b/Source/core/rendering/svg/RenderSVGText.cpp
index 947546a6cf3713044b34c24bc010b71dba0ccbe8..64a309d2525eea02220a641de09e98d14dbb2264 100644
--- a/Source/core/rendering/svg/RenderSVGText.cpp
+++ b/Source/core/rendering/svg/RenderSVGText.cpp
@@ -33,6 +33,7 @@
 #include "core/rendering/LayoutRepainter.h"
 #include "core/rendering/PointerEventsHitRules.h"
 #include "core/rendering/style/ShadowList.h"
+#include "core/rendering/svg/RenderSVGInline.h"
 #include "core/rendering/svg/RenderSVGInlineText.h"
 #include "core/rendering/svg/RenderSVGResource.h"
 #include "core/rendering/svg/RenderSVGRoot.h"
@@ -107,7 +108,7 @@ static inline void collectLayoutAttributes(RenderObject* text, Vector<SVGTextLay
     }
 }
 
-static inline bool findPreviousAndNextAttributes(RenderObject* root, RenderSVGInlineText* locateElement, SVGTextLayoutAttributes*& previous, SVGTextLayoutAttributes*& next)
+static inline bool findPreviousAndNextAttributes(RenderSVGText* root, RenderSVGInlineText* locateElement, SVGTextLayoutAttributes*& previous, SVGTextLayoutAttributes*& next)
 {
     ASSERT(root);
     ASSERT(locateElement);
@@ -128,7 +129,7 @@ static inline bool findPreviousAndNextAttributes(RenderObject* root, RenderSVGIn
             }
         } else if (current->isSVGInline()) {
             // Descend into text content (if possible).
-            if (RenderObject* child = current->firstChild()) {
+            if (RenderObject* child = toRenderSVGInline(current)->firstChild()) {
                 current = child;
                 continue;
             }