Move some dependencies of ExtensionService down to extensions.

chrome/browser/extensions/external_provider_interface.h

-// Copyright (c) 2012 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_EXTERNAL_PROVIDER_INTERFACE_H_
-#define CHROME_BROWSER_EXTENSIONS_EXTERNAL_PROVIDER_INTERFACE_H_
-
-#include <vector>
-
-#include "base/memory/linked_ptr.h"
-#include "extensions/common/manifest.h"
-
-class GURL;
-
-namespace base {
-class FilePath;
-class Version;
-}
-
-namespace extensions {
-
-// This class is an abstract class for implementing external extensions
-// providers.
-class ExternalProviderInterface {
- public:
-  // ExternalProvider uses this interface to communicate back to the
-  // caller what extensions are registered, and which |id|, |version| and |path|
-  // they have. See also VisitRegisteredExtension below. Ownership of |version|
-  // is not transferred to the visitor.  Callers of the methods below must
-  // ensure that |id| is a valid extension id (use Extension::IdIsValid(id)).
-  class VisitorInterface {
-   public:
-    // Return true if the extension install will proceed.  Install will not
-    // proceed if the extension is already installed from a higher priority
-    // location.
-    virtual bool OnExternalExtensionFileFound(
-        const std::string& id,
-        const base::Version* version,
-        const base::FilePath& path,
-        Manifest::Location location,
-        int creation_flags,
-        bool mark_acknowledged) = 0;
-
-    // Return true if the extension install will proceed.  Install might not
-    // proceed if the extension is already installed from a higher priority
-    // location.
-    virtual bool OnExternalExtensionUpdateUrlFound(
-        const std::string& id,
-        const GURL& update_url,
-        Manifest::Location location,
-        int creation_flags,
-        bool mark_acknowledged) = 0;
-
-    // Called after all the external extensions have been reported
-    // through the above two methods. |provider| is a pointer to the
-    // provider that is now ready (typically this), and the
-    // implementation of OnExternalProviderReady() should be able to
-    // safely assert that provider->IsReady().
-    virtual void OnExternalProviderReady(
-        const ExternalProviderInterface* provider) = 0;
-
-   protected:
-    virtual ~VisitorInterface() {}
-  };
-
-  virtual ~ExternalProviderInterface() {}
-
-  // The visitor (ExtensionsService) calls this function before it goes away.
-  virtual void ServiceShutdown() = 0;
-
-  // Enumerate registered extensions, calling
-  // OnExternalExtension(File|UpdateUrl)Found on the |visitor| object for each
-  // registered extension found.
-  virtual void VisitRegisteredExtension() = 0;
-
-  // Test if this provider has an extension with id |id| registered.
-  virtual bool HasExtension(const std::string& id) const = 0;
-
-  // Gets details of an extension by its id.  Output params will be set only
-  // if they are not NULL.  If an output parameter is not specified by the
-  // provider type, it will not be changed.
-  // This function is no longer used outside unit tests.
-  virtual bool GetExtensionDetails(
-      const std::string& id,
-      Manifest::Location* location,
-      scoped_ptr<base::Version>* version) const = 0;
-
-  // Determines if this provider had loaded the list of external extensions
-  // from its source.
-  virtual bool IsReady() const = 0;
-};
-
-typedef std::vector<linked_ptr<ExternalProviderInterface> >
-    ProviderCollection;
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_EXTERNAL_PROVIDER_INTERFACE_H_