Make RenderObject::style() return a const object

Source/core/rendering/RenderInline.cpp

Index: Source/core/rendering/RenderInline.cpp
diff --git a/Source/core/rendering/RenderInline.cpp b/Source/core/rendering/RenderInline.cpp
index a431a76f93976c69a50e131323494e28f3e980ad..a779d6584169564b0ca28e70031ac47a5c74d5a9 100644
--- a/Source/core/rendering/RenderInline.cpp
+++ b/Source/core/rendering/RenderInline.cpp
@@ -196,7 +196,8 @@ void RenderInline::styleDidChange(StyleDifference diff, const RenderStyle* oldSt
     // e.g., <font>foo <h4>goo</h4> moo</font>.  The <font> inlines before
     // and after the block share the same style, but the block doesn't
     // need to pass its style on to anyone else.
-    RenderStyle* newStyle = style();
+    // FIXME: For setStyle below.
+    RenderStyle* newStyle = deprecatedMutableStyle();
     RenderInline* continuation = inlineElementContinuation();
     for (RenderInline* currCont = continuation; currCont; currCont = currCont->inlineElementContinuation()) {
         RenderBoxModelObject* nextCont = currCont->continuation();
@@ -233,7 +234,7 @@ void RenderInline::updateAlwaysCreateLineBoxes(bool fullLayout)
     if (alwaysCreateLineBoxes())
         return;
 
-    RenderStyle* parentStyle = parent()->style();
+    const RenderStyle* parentStyle = parent()->style();
     RenderInline* parentRenderInline = parent()->isRenderInline() ? toRenderInline(parent()) : 0;
     bool checkFonts = document().inNoQuirksMode();
     bool alwaysCreateLineBoxesNew = (parentRenderInline && parentRenderInline->alwaysCreateLineBoxes())
@@ -246,7 +247,7 @@ void RenderInline::updateAlwaysCreateLineBoxes(bool fullLayout)
     if (!alwaysCreateLineBoxesNew && checkFonts && document().styleEngine()->usesFirstLineRules()) {
         // Have to check the first line style as well.
         parentStyle = parent()->style(true);
-        RenderStyle* childStyle = style(true);
+        const RenderStyle* childStyle = style(true);
         alwaysCreateLineBoxesNew = !parentStyle->font().fontMetrics().hasIdenticalAscentDescentAndLineGap(childStyle->font().fontMetrics())
         || childStyle->verticalAlign() != BASELINE
         || parentStyle->lineHeight() != childStyle->lineHeight();
@@ -364,7 +365,7 @@ void RenderInline::addChildIgnoringContinuation(RenderObject* newChild, RenderOb
 RenderInline* RenderInline::clone() const
 {
     RenderInline* cloneInline = new RenderInline(node());
-    cloneInline->setStyle(style());
+    cloneInline->setStyle(deprecatedMutableStyle());
     cloneInline->setFlowThreadState(flowThreadState());
     return cloneInline;
 }
@@ -1316,7 +1317,7 @@ InlineFlowBox* RenderInline::createAndAppendInlineFlowBox()
 LayoutUnit RenderInline::lineHeight(bool firstLine, LineDirectionMode /*direction*/, LinePositionMode /*linePositionMode*/) const
 {
     if (firstLine && document().styleEngine()->usesFirstLineRules()) {
-        RenderStyle* s = style(firstLine);
+        const RenderStyle* s = style(firstLine);
         if (s != style())
             return s->computedLineHeight();
     }