Make RenderObject::style() return a const object

Source/core/html/shadow/TextControlInnerElements.h

Index: Source/core/html/shadow/TextControlInnerElements.h
diff --git a/Source/core/html/shadow/TextControlInnerElements.h b/Source/core/html/shadow/TextControlInnerElements.h
index a7ff7ae09ed4e79dd06b9b9f7ecaa4ea0b55a660..8c8b5330a9342f32f31cd80841d72cb7873b0533 100644
--- a/Source/core/html/shadow/TextControlInnerElements.h
+++ b/Source/core/html/shadow/TextControlInnerElements.h
@@ -38,7 +38,7 @@ public:
 
 protected:
     explicit TextControlInnerContainer(Document&);
-    virtual RenderObject* createRenderer(RenderStyle*) override;
+    virtual RenderObject* createRenderer(const RenderStyle*) override;
 };
 
 class EditingViewPortElement final : public HTMLDivElement {
@@ -61,7 +61,7 @@ public:
 
 private:
     explicit TextControlInnerEditorElement(Document&);
-    virtual RenderObject* createRenderer(RenderStyle*) override;
+    virtual RenderObject* createRenderer(const RenderStyle*) override;
     virtual PassRefPtr<RenderStyle> customStyleForRenderer() override;
     virtual bool supportsFocus() const override { return false; }
 };