Make RenderObject::style() return a const object

Source/core/rendering/RenderText.cpp

Index: Source/core/rendering/RenderText.cpp
diff --git a/Source/core/rendering/RenderText.cpp b/Source/core/rendering/RenderText.cpp
index 7a80283427814932a529ad7cbfbb4096192223da..27fe7bc9ad40dfd9371406b4077e548828340649 100644
--- a/Source/core/rendering/RenderText.cpp
+++ b/Source/core/rendering/RenderText.cpp
@@ -200,7 +200,7 @@ void RenderText::styleDidChange(StyleDifference diff, const RenderStyle* oldStyl
         m_knownToHaveNoOverflowAndNoFallbackFonts = false;
     }
 
-    RenderStyle* newStyle = style();
+    const RenderStyle* newStyle = style();
     ETextTransform oldTransform = oldStyle ? oldStyle->textTransform() : TTNONE;
     ETextSecurity oldSecurity = oldStyle ? oldStyle->textSecurity() : TSNONE;
     if (oldTransform != newStyle->textTransform() || oldSecurity != newStyle->textSecurity())
@@ -668,7 +668,7 @@ LayoutRect RenderText::localCaretRect(InlineBox* inlineBox, int caretOffset, Lay
         *extraWidthToEndOfLine = (box->root().logicalWidth() + rootLeft) - (left + 1);
 
     RenderBlock* cb = containingBlock();
-    RenderStyle* cbStyle = cb->style();
+    const RenderStyle* cbStyle = cb->style();
 
     float leftEdge;
     float rightEdge;
@@ -727,7 +727,7 @@ ALWAYS_INLINE float RenderText::widthFromCache(const Font& f, int start, int len
         bool isSpace;
         ASSERT(m_text);
         StringImpl& text = *m_text.impl();
-        RenderStyle* renderStyle = style();
+        const RenderStyle* renderStyle = style();
         for (int i = start; i < start + len; i++) {
             char c = text[i];
             // If glyph is not present in primary font then we cannot calculate width based on primary
@@ -893,7 +893,7 @@ void RenderText::computePreferredLogicalWidths(float leadWidth)
 
 static inline float hyphenWidth(RenderText* renderer, const Font& font, TextDirection direction)
 {
-    RenderStyle* style = renderer->style();
+    const RenderStyle* style = renderer->style();
     return font.width(constructTextRun(renderer, font, style->hyphenString().string(), style, direction));
 }
 
@@ -918,7 +918,7 @@ void RenderText::computePreferredLogicalWidths(float leadWidth, HashSet<const Si
     m_hasBreakableEnd = false;
     m_hasEndWhiteSpace = false;
 
-    RenderStyle* styleToUse = style();
+    const RenderStyle* styleToUse = style();
     const Font& f = styleToUse->font(); // FIXME: This ignores first-line.
     float wordSpacing = styleToUse->wordSpacing();
     int len = textLength();