Make RenderObject::style() return a const object

Source/core/rendering/TextRunConstructor.cpp

Index: Source/core/rendering/TextRunConstructor.cpp
diff --git a/Source/core/rendering/TextRunConstructor.cpp b/Source/core/rendering/TextRunConstructor.cpp
index 8ee86fe473bf9cc7dd9123bbfca7430c1b87c9ff..905093d8b400917810b089ac72ddef8ddb30bf04 100644
--- a/Source/core/rendering/TextRunConstructor.cpp
+++ b/Source/core/rendering/TextRunConstructor.cpp
@@ -38,7 +38,7 @@
 namespace blink {
 
 template <typename CharacterType>
-static inline TextRun constructTextRunInternal(RenderObject* context, const Font& font, const CharacterType* characters, int length, RenderStyle* style, TextDirection direction)
+static inline TextRun constructTextRunInternal(RenderObject* context, const Font& font, const CharacterType* characters, int length, const RenderStyle* style, TextDirection direction)
 {
     ASSERT(style);
     TextRun::ExpansionBehavior expansion = TextRun::AllowTrailingExpansion | TextRun::ForbidLeadingExpansion;
@@ -48,7 +48,7 @@ static inline TextRun constructTextRunInternal(RenderObject* context, const Font
 }
 
 template <typename CharacterType>
-static inline TextRun constructTextRunInternal(RenderObject* context, const Font& font, const CharacterType* characters, int length, RenderStyle* style, TextDirection direction, TextRunFlags flags)
+static inline TextRun constructTextRunInternal(RenderObject* context, const Font& font, const CharacterType* characters, int length, const RenderStyle* style, TextDirection direction, TextRunFlags flags)
 {
     ASSERT(style);
 
@@ -66,24 +66,24 @@ static inline TextRun constructTextRunInternal(RenderObject* context, const Font
     return run;
 }
 
-TextRun constructTextRun(RenderObject* context, const Font& font, const LChar* characters, int length, RenderStyle* style, TextDirection direction)
+TextRun constructTextRun(RenderObject* context, const Font& font, const LChar* characters, int length, const RenderStyle* style, TextDirection direction)
 {
     return constructTextRunInternal(context, font, characters, length, style, direction);
 }
 
-TextRun constructTextRun(RenderObject* context, const Font& font, const UChar* characters, int length, RenderStyle* style, TextDirection direction)
+TextRun constructTextRun(RenderObject* context, const Font& font, const UChar* characters, int length, const RenderStyle* style, TextDirection direction)
 {
     return constructTextRunInternal(context, font, characters, length, style, direction);
 }
 
-TextRun constructTextRun(RenderObject* context, const Font& font, const RenderText* text, RenderStyle* style, TextDirection direction)
+TextRun constructTextRun(RenderObject* context, const Font& font, const RenderText* text, const RenderStyle* style, TextDirection direction)
 {
     if (text->is8Bit())
         return constructTextRunInternal(context, font, text->characters8(), text->textLength(), style, direction);
     return constructTextRunInternal(context, font, text->characters16(), text->textLength(), style, direction);
 }
 
-TextRun constructTextRun(RenderObject* context, const Font& font, const RenderText* text, unsigned offset, unsigned length, RenderStyle* style, TextDirection direction)
+TextRun constructTextRun(RenderObject* context, const Font& font, const RenderText* text, unsigned offset, unsigned length, const RenderStyle* style, TextDirection direction)
 {
     ASSERT(offset + length <= text->textLength());
     if (text->is8Bit())
@@ -91,7 +91,7 @@ TextRun constructTextRun(RenderObject* context, const Font& font, const RenderTe
     return constructTextRunInternal(context, font, text->characters16() + offset, length, style, direction);
 }
 
-TextRun constructTextRun(RenderObject* context, const Font& font, const String& string, RenderStyle* style, TextDirection direction, TextRunFlags flags)
+TextRun constructTextRun(RenderObject* context, const Font& font, const String& string, const RenderStyle* style, TextDirection direction, TextRunFlags flags)
 {
     unsigned length = string.length();
     if (!length)
@@ -101,13 +101,13 @@ TextRun constructTextRun(RenderObject* context, const Font& font, const String&
     return constructTextRunInternal(context, font, string.characters16(), length, style, direction, flags);
 }
 
-TextRun constructTextRun(RenderObject* context, const Font& font, const String& string, RenderStyle* style, TextRunFlags flags)
+TextRun constructTextRun(RenderObject* context, const Font& font, const String& string, const RenderStyle* style, TextRunFlags flags)
 {
     bool hasStrongDirectionality;
     return constructTextRun(context, font, string, style, determineDirectionality(string, hasStrongDirectionality), flags);
 }
 
-TextRun constructTextRun(RenderObject* context, const Font& font, const RenderText* text, unsigned offset, unsigned length, RenderStyle* style)
+TextRun constructTextRun(RenderObject* context, const Font& font, const RenderText* text, unsigned offset, unsigned length, const RenderStyle* style)
 {
     ASSERT(offset + length <= text->textLength());
     TextRun run = text->is8Bit()