Extract ErrorConsole from ExtensionSystem.

chrome/browser/extensions/error_console/error_console_factory.h

Index: chrome/browser/extensions/error_console/error_console_factory.h
diff --git a/chrome/browser/extensions/error_console/error_console_factory.h b/chrome/browser/extensions/error_console/error_console_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..740be0ed623797aa6f7ad15bef6699b717082782
--- /dev/null
+++ b/chrome/browser/extensions/error_console/error_console_factory.h
@@ -0,0 +1,37 @@
+// Copyright 2015 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_ERROR_CONSOLE_ERROR_CONSOLE_FACTORY_H_
+#define CHROME_BROWSER_EXTENSIONS_ERROR_CONSOLE_ERROR_CONSOLE_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+namespace extensions {
+
+class ErrorConsole;
+
+class ErrorConsoleFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static ErrorConsole* GetForBrowserContext(content::BrowserContext* context);
+  static ErrorConsoleFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<ErrorConsoleFactory>;
+
+  ErrorConsoleFactory();
+  ~ErrorConsoleFactory() override;
+
+  // BrowserContextKeyedServiceFactory implementation
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+  content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(ErrorConsoleFactory);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_ERROR_CONSOLE_ERROR_CONSOLE_FACTORY_H_