Make RenderObject::style() return a const object

Source/core/rendering/RenderBlockLineLayout.cpp

Index: Source/core/rendering/RenderBlockLineLayout.cpp
diff --git a/Source/core/rendering/RenderBlockLineLayout.cpp b/Source/core/rendering/RenderBlockLineLayout.cpp
index f7b1a33783a456f56acd24316e885001c5e7aca8..939254bccbfbd8692b00e3b93ab2dd60a2cd3e8d 100644
--- a/Source/core/rendering/RenderBlockLineLayout.cpp
+++ b/Source/core/rendering/RenderBlockLineLayout.cpp
@@ -785,7 +785,7 @@ void RenderBlockFlow::layoutRunsAndFloatsInRange(LineLayoutState& layoutState,
     InlineBidiResolver& resolver, const InlineIterator& cleanLineStart,
     const BidiStatus& cleanLineBidiStatus)
 {
-    RenderStyle* styleToUse = style();
+    const RenderStyle* styleToUse = style();
     bool paginated = view()->layoutState() && view()->layoutState()->isPaginated();
     LineMidpointState& lineMidpointState = resolver.midpointState();
     InlineIterator endOfLine = resolver.position();
@@ -1153,7 +1153,7 @@ static LayoutUnit getBPMWidth(LayoutUnit childValue, Length cssUnit)
 
 static LayoutUnit getBorderPaddingMargin(RenderBoxModelObject* child, bool endOfInline)
 {
-    RenderStyle* childStyle = child->style();
+    const RenderStyle* childStyle = child->style();
     if (endOfInline) {
         return getBPMWidth(child->marginEnd(), childStyle->marginEnd()) +
             getBPMWidth(child->paddingEnd(), childStyle->paddingEnd()) +
@@ -1211,7 +1211,7 @@ void RenderBlockFlow::computeInlinePreferredLogicalWidths(LayoutUnit& minLogical
     FloatWillBeLayoutUnit inlineMax;
     FloatWillBeLayoutUnit inlineMin;
 
-    RenderStyle* styleToUse = style();
+    const RenderStyle* styleToUse = style();
     RenderBlock* containingBlock = this->containingBlock();
     LayoutUnit cw = containingBlock ? containingBlock->contentLogicalWidth() : LayoutUnit();
 
@@ -1279,7 +1279,7 @@ void RenderBlockFlow::computeInlinePreferredLogicalWidths(LayoutUnit& minLogical
             // values (if any of them are larger than our current min/max). We then look at
             // the width of the last non-breakable run and use that to start a new line
             // (unless we end in whitespace).
-            RenderStyle* childStyle = child->style();
+            const RenderStyle* childStyle = child->style();
             FloatWillBeLayoutUnit childMin;
             FloatWillBeLayoutUnit childMax;