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 c7f911171800c5b8decccadf504e8c50eee63b43..a766b30e9aa9137b9064b521c17154c9c950f5a5 100644
--- a/Source/core/rendering/RenderCombineText.cpp
+++ b/Source/core/rendering/RenderCombineText.cpp
@@ -116,7 +116,7 @@ void RenderCombineText::updateFont()
 
     FontSelector* fontSelector = style()->font().fontSelector();
 
-    bool shouldUpdateFont = style()->setFontDescription(description); // Need to change font orientation to horizontal.
+    bool shouldUpdateFont = mutableStyleRef().setFontDescription(description); // Need to change font orientation to horizontal.
 
     if (m_combinedTextWidth <= emWidth) {
         m_scaleX = 1.0f;
@@ -132,7 +132,7 @@ void RenderCombineText::updateFont()
                 m_combinedTextWidth = runWidth;
 
                 // Replace my font with the new one.
-                shouldUpdateFont = style()->setFontDescription(description);
+                shouldUpdateFont = mutableStyleRef().setFontDescription(description);
                 break;
             }
         }