DevTools: reduce ResourceAgent dependency on PageAgent.

Source/core/inspector/EditedResourcesContentManager.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 "core/inspector/EditedResourcesContentManager.h"
+
+namespace blink {
+
+PassOwnPtrWillBeRawPtr<EditedResourcesContentManager> EditedResourcesContentManager::create()
+{
+    return adoptPtrWillBeNoop(new EditedResourcesContentManager());
+}
+
+EditedResourcesContentManager::EditedResourcesContentManager() { }
+
+EditedResourcesContentManager::~EditedResourcesContentManager() { }
+
+void EditedResourcesContentManager::clear()
+{
+    m_editedResourceContent.clear();
+}
+
+void EditedResourcesContentManager::add(const String& url, const String& content)
+{
+    m_editedResourceContent.set(url, content);
+}
+
+bool EditedResourcesContentManager::get(const String& url, String* content)
+{
+    if (!m_editedResourceContent.contains(url))
+        return false;
+    *content = m_editedResourceContent.get(url);
+    return true;
+}
+
+} // namespace blink