Move ExtensionCache to //extensions

extensions/browser/updater/null_extension_cache.h

 // 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.
 
-#ifndef CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_CACHE_FAKE_H_
-#define CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_CACHE_FAKE_H_
+#ifndef EXTENSIONS_BROWSER_UPDATER_NULL_EXTENSION_CACHE_H_
+#define EXTENSIONS_BROWSER_UPDATER_NULL_EXTENSION_CACHE_H_
 
-#include <map>
-#include <set>
-#include <string>
-
-#include "chrome/browser/extensions/updater/extension_cache.h"
+#include "extensions/browser/updater/extension_cache.h"
 
 namespace extensions {
 
-// Fake implementation of extensions ExtensionCache that can be used in tests.
-class ExtensionCacheFake : public ExtensionCache {
+// Implements a pass-thru (i.e. do-nothing) ExtensionCache.
+class NullExtensionCache : public ExtensionCache {
  public:
-  ExtensionCacheFake();
-  virtual ~ExtensionCacheFake();
+  NullExtensionCache();
+  virtual ~NullExtensionCache();
 
-  // Implementation of ExtensionCache.
+  // ExtensionCache implementation.
   virtual void Start(const base::Closure& callback) override;
   virtual void Shutdown(const base::Closure& callback) override;
   virtual void AllowCaching(const std::string& id) override;
   virtual bool GetExtension(const std::string& id,
                             base::FilePath* file_path,
                             std::string* version) override;
   virtual void PutExtension(const std::string& id,
                             const base::FilePath& file_path,
                             const std::string& version,
                             const PutExtensionCallback& callback) override;
 
  private:
-  typedef std::map<std::string, std::pair<std::string, base::FilePath> > Map;
-  // Set of extensions that can be cached.
-  std::set<std::string> allowed_extensions_;
-
-  // Map of know extensions.
-  Map cache_;
-
-  DISALLOW_COPY_AND_ASSIGN(ExtensionCacheFake);
+  DISALLOW_COPY_AND_ASSIGN(NullExtensionCache);
 };
 
 }  // namespace extensions
 
-#endif  // CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_CACHE_FAKE_H_
+#endif  // EXTENSIONS_BROWSER_UPDATER_NULL_EXTENSION_CACHE_H_