Make RenderObject::style() return a const object

Source/core/html/shadow/SliderThumbElement.cpp

Index: Source/core/html/shadow/SliderThumbElement.cpp
diff --git a/Source/core/html/shadow/SliderThumbElement.cpp b/Source/core/html/shadow/SliderThumbElement.cpp
index 612ba1263d026f22c188e754acce8e64dbb4da28..18ed4c55cc05de7def56b2c9ae9f263b3b11e714 100644
--- a/Source/core/html/shadow/SliderThumbElement.cpp
+++ b/Source/core/html/shadow/SliderThumbElement.cpp
@@ -54,7 +54,7 @@ using namespace HTMLNames;
 inline static bool hasVerticalAppearance(HTMLInputElement* input)
 {
     ASSERT(input->renderer());
-    RenderStyle* sliderStyle = input->renderer()->style();
+    const RenderStyle* sliderStyle = input->renderer()->style();
 
     return sliderStyle->appearance() == SliderVerticalPart;
 }
@@ -81,7 +81,7 @@ void SliderThumbElement::setPositionFromValue()
         renderer()->setNeedsLayoutAndFullPaintInvalidation();
 }
 
-RenderObject* SliderThumbElement::createRenderer(RenderStyle*)
+RenderObject* SliderThumbElement::createRenderer(const RenderStyle*)
 {
     return new LayoutSliderThumb(this);
 }
@@ -283,7 +283,7 @@ const AtomicString& SliderThumbElement::shadowPseudoId() const
     if (!input || !input->renderer())
         return sliderThumbShadowPartId();
 
-    RenderStyle* sliderStyle = input->renderer()->style();
+    const RenderStyle* sliderStyle = input->renderer()->style();
     switch (sliderStyle->appearance()) {
     case MediaSliderPart:
     case MediaSliderThumbPart:
@@ -306,7 +306,7 @@ inline SliderContainerElement::SliderContainerElement(Document& document)
 
 DEFINE_NODE_FACTORY(SliderContainerElement)
 
-RenderObject* SliderContainerElement::createRenderer(RenderStyle*)
+RenderObject* SliderContainerElement::createRenderer(const RenderStyle*)
 {
     return new LayoutSliderContainer(this);
 }
@@ -319,7 +319,7 @@ const AtomicString& SliderContainerElement::shadowPseudoId() const
     if (!shadowHost() || !shadowHost()->renderer())
         return sliderContainer;
 
-    RenderStyle* sliderStyle = shadowHost()->renderer()->style();
+    const RenderStyle* sliderStyle = shadowHost()->renderer()->style();
     switch (sliderStyle->appearance()) {
     case MediaSliderPart:
     case MediaSliderThumbPart: