Use base::Callback in Quota related code.

content/browser/in_process_webkit/indexed_db_quota_client.h

Index: content/browser/in_process_webkit/indexed_db_quota_client.h
diff --git a/content/browser/in_process_webkit/indexed_db_quota_client.h b/content/browser/in_process_webkit/indexed_db_quota_client.h
index 8b2838e8843ba58dfb83a5c1b22c4dbf5fc26acc..90f13a2fb51126c28944cfb981c12c8a01318a46 100644
--- a/content/browser/in_process_webkit/indexed_db_quota_client.h
+++ b/content/browser/in_process_webkit/indexed_db_quota_client.h
@@ -33,15 +33,15 @@ class IndexedDBQuotaClient : public quota::QuotaClient,
   virtual void OnQuotaManagerDestroyed() OVERRIDE;
   virtual void GetOriginUsage(const GURL& origin_url,
                               quota::StorageType type,
-                              GetUsageCallback* callback) OVERRIDE;
+                              const GetUsageCallback& callback) OVERRIDE;
   virtual void GetOriginsForType(quota::StorageType type,
-                                 GetOriginsCallback* callback) OVERRIDE;
+                                 const GetOriginsCallback& callback) OVERRIDE;
   virtual void GetOriginsForHost(quota::StorageType type,
                                  const std::string& host,
-                                 GetOriginsCallback* callback) OVERRIDE;
+                                 const GetOriginsCallback& callback) OVERRIDE;
   virtual void DeleteOriginData(const GURL& origin,
                                 quota::StorageType type,
-                                DeletionCallback* callback) OVERRIDE;
+                                const DeletionCallback& callback) OVERRIDE;
  private:
   class HelperTask;
   class GetOriginUsageTask;
@@ -51,17 +51,17 @@ class IndexedDBQuotaClient : public quota::QuotaClient,
   class DeleteOriginTask;
 
   typedef quota::CallbackQueueMap1
-      <GetUsageCallback*,
+      <GetUsageCallback,
        GURL,  // origin
        int64
       > UsageForOriginCallbackMap;
   typedef quota::CallbackQueue2
-      <GetOriginsCallback*,
+      <GetOriginsCallback,
        const std::set<GURL>&,
        quota::StorageType
       > OriginsForTypeCallbackQueue;
   typedef quota::CallbackQueueMap2
-      <GetOriginsCallback*,
+      <GetOriginsCallback,
        std::string,  // host
        const std::set<GURL>&,
        quota::StorageType