binding: Lets Dictionary::getPropertyNames, etc. rethrow an exception.

third_party/WebKit/Source/modules/fetch/Headers.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 "modules/fetch/Headers.h"
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/V8IteratorResultValue.h"
 #include "core/dom/Iterator.h"
@@ skipping 266 matching lines @@
     }
     append(object[i][0], object[i][1], exceptionState);
     if (exceptionState.hadException())
       return;
   }
 }
 
 void Headers::fillWith(const Dictionary& object,
                        ExceptionState& exceptionState) {
   ASSERT(!m_headerList->size());
-  Vector<String> keys;
-  object.getPropertyNames(keys);
-  if (!keys.size())
+  const Vector<String>& keys = object.getPropertyNames(exceptionState);
+  if (exceptionState.hadException() || !keys.size())
     return;
 
   // "3. Otherwise, if |object| is an open-ended dictionary, then for each
   //    |header| in object, run these substeps:
   //    1. Set |header|'s key to |header|'s key, converted to ByteString.
   //       Rethrow any exception.
   //    2. Append |header|'s key/|header|'s value to |headers|. Rethrow any
   //       exception."
   // FIXME: Support OpenEndedDictionary<ByteString>.
   for (size_t i = 0; i < keys.size(); ++i) {
@@ skipping 18 matching lines @@
   visitor->trace(m_headerList);
 }
 
 PairIterable<String, String>::IterationSource* Headers::startIteration(
     ScriptState*,
     ExceptionState&) {
   return new HeadersIterationSource(m_headerList);
 }
 
 }  // namespace blink