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 447df21ca06ace55048dc7ed306856eaf0a59ac9..092664c34e41ab4d124917a8d117b7ebc7ce218c 100644
--- a/Source/core/svg/SVGLengthContext.cpp
+++ b/Source/core/svg/SVGLengthContext.cpp
@@ -185,7 +185,7 @@ float SVGLengthContext::convertValueFromPercentageToUserUnits(const SVGLength& v
     return value.scaleByPercentage(dimensionForLengthMode(value.unitMode(), viewportSize));
 }
 
-static inline LayoutStyle* layoutStyleForLengthResolving(const SVGElement* context)
+static inline const LayoutStyle* layoutStyleForLengthResolving(const SVGElement* context)
 {
     if (!context)
         return 0;
@@ -204,7 +204,7 @@ static inline LayoutStyle* layoutStyleForLengthResolving(const SVGElement* conte
 
 float SVGLengthContext::convertValueFromUserUnitsToEMS(float value) const
 {
-    LayoutStyle* style = layoutStyleForLengthResolving(m_context);
+    const LayoutStyle* style = layoutStyleForLengthResolving(m_context);
     if (!style)
         return 0;
 
@@ -217,7 +217,7 @@ float SVGLengthContext::convertValueFromUserUnitsToEMS(float value) const
 
 float SVGLengthContext::convertValueFromEMSToUserUnits(float value) const
 {
-    LayoutStyle* style = layoutStyleForLengthResolving(m_context);
+    const LayoutStyle* style = layoutStyleForLengthResolving(m_context);
     if (!style)
         return 0;
     return value * style->specifiedFontSize();
@@ -225,7 +225,7 @@ float SVGLengthContext::convertValueFromEMSToUserUnits(float value) const
 
 float SVGLengthContext::convertValueFromUserUnitsToEXS(float value) const
 {
-    LayoutStyle* style = layoutStyleForLengthResolving(m_context);
+    const LayoutStyle* style = layoutStyleForLengthResolving(m_context);
     if (!style)
         return 0;
 
@@ -240,7 +240,7 @@ float SVGLengthContext::convertValueFromUserUnitsToEXS(float value) const
 
 float SVGLengthContext::convertValueFromEXSToUserUnits(float value) const
 {
-    LayoutStyle* style = layoutStyleForLengthResolving(m_context);
+    const LayoutStyle* style = layoutStyleForLengthResolving(m_context);
     if (!style)
         return 0;