refactoring for pdf viewer lib

experimental/PdfViewer/autogen/SkPdfCheckboxFieldDictionary_autogen.h

 #ifndef __DEFINED__SkPdfCheckboxFieldDictionary
 #define __DEFINED__SkPdfCheckboxFieldDictionary
 
 #include "SkPdfUtils.h"
 #include "SkPdfEnums_autogen.h"
 #include "SkPdfArray_autogen.h"
 #include "SkPdfDictionary_autogen.h"
 
 // Additional entry specific to a checkbox field
 class SkPdfCheckboxFieldDictionary : public SkPdfDictionary {
@@ skipping 514 matching lines @@
 
   SkPdfCheckboxFieldDictionary& operator=(const SkPdfCheckboxFieldDictionary& from) {this->fPodofoDoc = from.fPodofoDoc; this->fPodofoObj = from.fPodofoObj; return *this;}
 
 /** (Optional; inheritable; PDF 1.4) A text string to be used in place of the V entry for the
  *  value of the field.
 **/
   bool has_Opt() const {
     return (ObjectFromDictionary(fPodofoDoc, fPodofoObj->GetDictionary(), "Opt", "", NULL));
   }
 
-  std::string Opt() const {
-    std::string ret;
-    if (StringFromDictionary(fPodofoDoc, fPodofoObj->GetDictionary(), "Opt", "", &ret)) return ret;
-    // TODO(edisonn): warn about missing required field, assert for known good pdfs
-    return "";
-  }
-
+  std::string Opt() const;
 };
 
 #endif  // __DEFINED__SkPdfCheckboxFieldDictionary