Make RenderObject::style() return a const object

Source/core/rendering/RenderCombineText.cpp

Index: Source/core/rendering/RenderCombineText.cpp
diff --git a/Source/core/rendering/RenderCombineText.cpp b/Source/core/rendering/RenderCombineText.cpp
index fb58e1ab932675aedca302c19fcd03567c36ee0b..0aefedc35cd78dc4803a46e85235b7c0615d8e26 100644
--- a/Source/core/rendering/RenderCombineText.cpp
+++ b/Source/core/rendering/RenderCombineText.cpp
@@ -115,7 +115,7 @@ void RenderCombineText::combineText()
     FontSelector* fontSelector = style()->font().fontSelector();
 
     if (m_isCombined)
-        shouldUpdateFont = style()->setFontDescription(description); // Need to change font orientation to horizontal.
+        shouldUpdateFont = deprecatedMutableStyle()->setFontDescription(description); // Need to change font orientation to horizontal.
     else {
         // Need to try compressed glyphs.
         static const FontWidthVariant widthVariants[] = { HalfWidth, ThirdWidth, QuarterWidth };
@@ -129,14 +129,14 @@ void RenderCombineText::combineText()
                 m_isCombined = true;
 
                 // Replace my font with the new one.
-                shouldUpdateFont = style()->setFontDescription(description);
+                shouldUpdateFont = deprecatedMutableStyle()->setFontDescription(description);
                 break;
             }
         }
     }
 
     if (!m_isCombined)
-        shouldUpdateFont = style()->setFontDescription(originalFont().fontDescription());
+        shouldUpdateFont = deprecatedMutableStyle()->setFontDescription(originalFont().fontDescription());
 
     if (shouldUpdateFont)
         style()->font().update(fontSelector);