bindings: Use Maybe version of v8::String::NewFromUtf8()

Source/modules/fetch/Body.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/fetch/Body.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
@@ skipping 405 matching lines @@
     ASSERT(m_responseType == ResponseAsJSON);
     ScriptState::Scope scope(m_resolver->scriptState());
     v8::Isolate* isolate = m_resolver->scriptState()->isolate();
     v8::Local<v8::String> inputString = v8String(isolate, string);
     v8::TryCatch trycatch;
     v8::Local<v8::Value> parsed = v8::JSON::Parse(inputString);
     if (parsed.IsEmpty()) {
         if (trycatch.HasCaught())
             m_resolver->reject(trycatch.Exception());
         else
-            m_resolver->reject(v8::Exception::Error(v8::String::NewFromUtf8(isolate, "JSON parse error")));
+            m_resolver->reject(v8::Exception::Error(v8AtomicString(isolate, "JSON parse error")));
         return;
     }
     m_resolver->resolve(parsed);
 }
 
 // FileReaderLoaderClient functions.
 void Body::didStartLoading() { }
 void Body::didReceiveData() { }
 void Body::didFinishLoading()
 {
@@ skipping 42 matching lines @@
 
 void Body::didBlobHandleReceiveError(PassRefPtrWillBeRawPtr<DOMException> exception)
 {
     if (!m_resolver)
         return;
     m_resolver->reject(exception);
     m_resolver.clear();
 }
 
 } // namespace blink