Revert of [ServiceWorker] Make Response class better conformance with the spec.

Source/modules/serviceworkers/HeaderMap.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/serviceworkers/HeaderMap.h"
+
+#include "bindings/core/v8/ExceptionState.h"
+#include "modules/serviceworkers/HeaderMapForEachCallback.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
+#include "wtf/text/WTFString.h"
+
+namespace WebCore {
+
+PassRefPtr<HeaderMap> HeaderMap::create()
+{
+    return adoptRef(new HeaderMap);
+}
+
+PassRefPtr<HeaderMap> HeaderMap::create(const HashMap<String, String>& headers)
+{
+    return adoptRef(new HeaderMap(headers));
+}
+
+unsigned long HeaderMap::size() const
+{
+    return m_headers.size();
+}
+
+void HeaderMap::clear()
+{
+    m_headers.clear();
+}
+
+bool HeaderMap::remove(const String& key)
+{
+    if (!has(key))
+        return false;
+    m_headers.remove(key);
+    return true;
+}
+
+String HeaderMap::get(const String& key)
+{
+    return m_headers.get(key);
+}
+
+bool HeaderMap::has(const String& key)
+{
+    return m_headers.find(key) != m_headers.end();
+}
+
+void HeaderMap::set(const String& key, const String& value)
+{
+    m_headers.set(key, value);
+}
+
+void HeaderMap::forEach(PassOwnPtr<HeaderMapForEachCallback> callback, ScriptValue& thisArg)
+{
+    forEachInternal(callback, &thisArg);
+}
+
+void HeaderMap::forEach(PassOwnPtr<HeaderMapForEachCallback> callback)
+{
+    forEachInternal(callback, 0);
+}
+
+HeaderMap::HeaderMap()
+{
+    ScriptWrappable::init(this);
+}
+
+HeaderMap::HeaderMap(const HashMap<String, String>& headers)
+    : m_headers(headers)
+{
+    ScriptWrappable::init(this);
+}
+
+void HeaderMap::forEachInternal(PassOwnPtr<HeaderMapForEachCallback> callback, ScriptValue* thisArg)
+{
+    TrackExceptionState exceptionState;
+    for (HashMap<String, String>::const_iterator it = m_headers.begin(); it != m_headers.end(); ++it) {
+        if (thisArg)
+            callback->handleItem(*thisArg, it->value, it->key, this);
+        else
+            callback->handleItem(it->value, it->key, this);
+        if (exceptionState.hadException())
+            break;
+    }
+}
+
+} // namespace WebCore