Make RenderObject::style() return a const object

Source/core/dom/Text.cpp

Index: Source/core/dom/Text.cpp
diff --git a/Source/core/dom/Text.cpp b/Source/core/dom/Text.cpp
index c6a2a9895ec07ce6625614f6c468152ef9bd4c69..3ece62f31fbef87514926de3a994b825484a76f5 100644
--- a/Source/core/dom/Text.cpp
+++ b/Source/core/dom/Text.cpp
@@ -315,7 +315,7 @@ static bool isSVGText(Text* text)
     return parentOrShadowHostNode->isSVGElement() && !isSVGForeignObjectElement(*parentOrShadowHostNode);
 }
 
-RenderText* Text::createTextRenderer(RenderStyle* style)
+RenderText* Text::createTextRenderer(const RenderStyle* style)
 {
     if (isSVGText(this))
         return new RenderSVGInlineText(this, dataImpl());
@@ -383,7 +383,7 @@ void Text::recalcTextStyle(StyleRecalcChange change, Text* nextTextSibling)
 bool Text::needsWhitespaceRenderer()
 {
     ASSERT(!renderer());
-    if (RenderStyle* style = parentRenderStyle())
+    if (const RenderStyle* style = parentRenderStyle())
         return style->preserveNewline();
     return false;
 }