Kill WTF::DecimalNumber class

Source/platform/graphics/Color.cpp

Index: Source/platform/graphics/Color.cpp
diff --git a/Source/platform/graphics/Color.cpp b/Source/platform/graphics/Color.cpp
index 938e12cced410985b6be9c820ac5fb701b47fa33..3c0b7429750012fd7d9ff5b98a511972a5c3900d 100644
--- a/Source/platform/graphics/Color.cpp
+++ b/Source/platform/graphics/Color.cpp
@@ -26,10 +26,11 @@
 #include "config.h"
 #include "platform/graphics/Color.h"
 
+#include "platform/Decimal.h"
 #include "wtf/Assertions.h"
-#include "wtf/DecimalNumber.h"
 #include "wtf/HexNumber.h"
 #include "wtf/MathExtras.h"
+#include "wtf/dtoa.h"
 #include "wtf/text/StringBuilder.h"
 
 using namespace std;
@@ -243,9 +244,7 @@ String Color::serialized() const
     if (!alpha())
         result.append('0');
     else {
-        NumberToLStringBuffer buffer;
-        unsigned length = DecimalNumber(alpha() / 255.0).toStringDecimal(buffer, WTF::NumberToStringBufferLength);
-        result.append(buffer, length);
+        result.append(Decimal::fromDouble(alpha() / 255.0).toString());
     }
 
     result.append(')');