Drop unnecessary v8::TryCatch in V8StringResource::prepare()

Source/bindings/core/v8/V8StringResource.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 197 matching lines @@
 
         if (LIKELY(m_v8Object->IsString()))
             return true;
 
         if (LIKELY(m_v8Object->IsInt32())) {
             setString(int32ToWebCoreString(m_v8Object->Int32Value()));
             return true;
         }
 
         m_mode = DoNotExternalize;
-        v8::TryCatch block;
         m_v8Object = m_v8Object->ToString();
         // Handle the case where an exception is thrown as part of invoking toString on the object.
-        if (block.HasCaught()) {
-            block.ReThrow();
+        if (m_v8Object.IsEmpty())
             return false;
-        }
         return true;
     }
     operator String() const { return toString<String>(); }
     operator AtomicString() const { return toString<AtomicString>(); }
 
 private:
     bool isValid() const;
     String fallbackString() const;
 
     void setString(const String& string)
@@ skipping 53 matching lines @@
 }
 
 template<> inline String V8StringResource<TreatNullAndUndefinedAsNullString>::fallbackString() const
 {
     return String();
 }
 
 } // namespace blink
 
 #endif // V8StringResource_h