[Extensions] Pull ExtensionId into its own file

chrome/browser/extensions/api/declarative_content/chrome_content_rules_registry.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_API_DECLARATIVE_CONTENT_CHROME_CONTENT_RULES_REGISTRY_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_CHROME_CONTENT_RULES_REGISTRY_H_
 
 #include <stddef.h>
 
 #include <map>
 #include <memory>
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "chrome/browser/extensions/api/declarative_content/content_action.h"
 #include "chrome/browser/extensions/api/declarative_content/content_condition.h"
 #include "chrome/browser/extensions/api/declarative_content/content_predicate_evaluator.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "extensions/browser/api/declarative_content/content_rules_registry.h"
-#include "extensions/common/extension.h"
+#include "extensions/common/extension_id.h"
 
 namespace content {
 class BrowserContext;
 class WebContents;
 struct FrameNavigateParams;
 struct LoadCommittedDetails;
 }
 
 namespace extensions {
 
@@ skipping 149 matching lines @@
 
   // Manages our notification registrations.
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeContentRulesRegistry);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_CHROME_CONTENT_RULES_REGISTRY_H_