Make RenderObject::style() return a const object

Source/core/svg/SVGLengthContext.cpp

Index: Source/core/svg/SVGLengthContext.cpp
diff --git a/Source/core/svg/SVGLengthContext.cpp b/Source/core/svg/SVGLengthContext.cpp
index 9c1a4d15c19902e297c787185e7235ac2ac2bef3..877b78e0fdc964ead37cd771c40e76d52af293db 100644
--- a/Source/core/svg/SVGLengthContext.cpp
+++ b/Source/core/svg/SVGLengthContext.cpp
@@ -216,7 +216,7 @@ float SVGLengthContext::convertValueFromPercentageToUserUnits(const SVGLength& v
     return 0;
 }
 
-static inline RenderStyle* renderStyleForLengthResolving(const SVGElement* context)
+static inline const RenderStyle* renderStyleForLengthResolving(const SVGElement* context)
 {
     if (!context)
         return 0;
@@ -235,7 +235,7 @@ static inline RenderStyle* renderStyleForLengthResolving(const SVGElement* conte
 
 float SVGLengthContext::convertValueFromUserUnitsToEMS(float value, ExceptionState& exceptionState) const
 {
-    RenderStyle* style = renderStyleForLengthResolving(m_context);
+    const RenderStyle* style = renderStyleForLengthResolving(m_context);
     if (!style) {
         exceptionState.throwDOMException(NotSupportedError, "No context could be found.");
         return 0;
@@ -252,7 +252,7 @@ float SVGLengthContext::convertValueFromUserUnitsToEMS(float value, ExceptionSta
 
 float SVGLengthContext::convertValueFromEMSToUserUnits(float value, ExceptionState& exceptionState) const
 {
-    RenderStyle* style = renderStyleForLengthResolving(m_context);
+    const RenderStyle* style = renderStyleForLengthResolving(m_context);
     if (!style) {
         exceptionState.throwDOMException(NotSupportedError, "No context could be found.");
         return 0;
@@ -263,7 +263,7 @@ float SVGLengthContext::convertValueFromEMSToUserUnits(float value, ExceptionSta
 
 float SVGLengthContext::convertValueFromUserUnitsToEXS(float value, ExceptionState& exceptionState) const
 {
-    RenderStyle* style = renderStyleForLengthResolving(m_context);
+    const RenderStyle* style = renderStyleForLengthResolving(m_context);
     if (!style) {
         exceptionState.throwDOMException(NotSupportedError, "No context could be found.");
         return 0;
@@ -282,7 +282,7 @@ float SVGLengthContext::convertValueFromUserUnitsToEXS(float value, ExceptionSta
 
 float SVGLengthContext::convertValueFromEXSToUserUnits(float value, ExceptionState& exceptionState) const
 {
-    RenderStyle* style = renderStyleForLengthResolving(m_context);
+    const RenderStyle* style = renderStyleForLengthResolving(m_context);
     if (!style) {
         exceptionState.throwDOMException(NotSupportedError, "No context could be found.");
         return 0;