Get rid of use of CreateStringValue in chromeos/ directory.

base/values.h

Index: base/values.h
diff --git a/base/values.h b/base/values.h
index d7263dfbc731fa8998af0de79f64936399cca4d8..6b650052accf75d2e777e60e988526fbb609e078 100644
--- a/base/values.h
+++ b/base/values.h
@@ -66,10 +66,9 @@ class BASE_EXPORT Value {
 
   virtual ~Value();
 
-  // Convenience methods for creating Value objects for various
-  // kinds of values without thinking about which class implements them.
-  // These can always be expected to return a valid Value*.
   static Value* CreateNullValue();
+  // DEPRECATED: Do not use the following 5 functions. Instead, use
+  // new FundamentalValue or new StringValue.
   static FundamentalValue* CreateBooleanValue(bool in_value);
   static FundamentalValue* CreateIntegerValue(int in_value);
   static FundamentalValue* CreateDoubleValue(double in_value);