Remove //chrome dependency from ExtensionPrefs

extensions/browser/extension_prefs_observer.h

Index: extensions/browser/extension_prefs_observer.h
diff --git a/extensions/browser/extension_prefs_observer.h b/extensions/browser/extension_prefs_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..ff836810e7ee350ca21a9f0e6c271f31fce4355f
--- /dev/null
+++ b/extensions/browser/extension_prefs_observer.h
@@ -0,0 +1,41 @@
+// 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 EXTENSIONS_BROWSER_EXTENSION_PREFS_OBSERVER_H_
+#define EXTENSIONS_BROWSER_EXTENSION_PREFS_OBSERVER_H_
+
+#include <string>
+
+#include "base/time/time.h"
+
+namespace extensions {
+
+class ExtensionPrefs;
+
+class ExtensionPrefsObserver {
+ public:
+  // Called when the reasons for an extension being disabled have changed.
+  virtual void OnExtensionDisableReasonsChanged(const std::string& extension_id,
+                                                int disabled_reasons) {}
+
+  // Called when an extension is registered with ExtensionPrefs.
+  virtual void OnExtensionRegistered(const std::string& extension_id,
+                                     const base::Time& install_time,
+                                     bool is_enabled) {}
+
+  // Called when an extension's prefs have been loaded.
+  virtual void OnExtensionPrefsLoaded(const std::string& extension_id,
+                                      const ExtensionPrefs* prefs) {}
+
+  // Called when an extension's prefs are deleted.
+  virtual void OnExtensionPrefsDeleted(const std::string& extension_id) {}
+
+  // Called when an extension's enabled state pref is changed.
+  virtual void OnExtensionStateChanged(const std::string& extension_id,
+                                       bool state) {}
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_EXTENSION_PREFS_OBSERVER_H_