Get rid of the rest of CreateStringValue

base/values.h

Index: base/values.h
diff --git a/base/values.h b/base/values.h
index c478e3ac79e199ca4a79540ac29a59850789f632..1c8e642ca5ab158901dbb338ab95338394244931 100644
--- a/base/values.h
+++ b/base/values.h
@@ -42,9 +42,7 @@ class Value;
 typedef std::vector<Value*> ValueVector;
 typedef std::map<std::string, Value*> ValueMap;
 
-// The Value class is the base class for Values. A Value can be instantiated
-// via the Create*Value() factory methods, or by directly creating instances of
-// the subclasses.
+// The Value class is the base class for Values.
 //
 // See the file-level comment above for more information.
 class BASE_EXPORT Value {
@@ -69,8 +67,6 @@ class BASE_EXPORT Value {
   static FundamentalValue* CreateBooleanValue(bool in_value);
   static FundamentalValue* CreateIntegerValue(int in_value);
   static FundamentalValue* CreateDoubleValue(double in_value);
-  static StringValue* CreateStringValue(const std::string& in_value);
-  static StringValue* CreateStringValue(const string16& in_value);
 
   // Returns the type of the value stored by the current Value object.
   // Each type will be implemented by only one subclass of Value, so it's