Convert QuotaManager::GetLRUOrigin into a QuotaEvictionPolicy.

storage/browser/quota/quota_manager.h

Index: storage/browser/quota/quota_manager.h
diff --git a/storage/browser/quota/quota_manager.h b/storage/browser/quota/quota_manager.h
index 2729f6425abfc63efc3fc2ee0191f2f478cf1552..75f76357b09c685dc5a714369952045616a59aab 100644
--- a/storage/browser/quota/quota_manager.h
+++ b/storage/browser/quota/quota_manager.h
@@ -306,6 +306,8 @@ class STORAGE_EXPORT QuotaManager
   class DumpQuotaTableHelper;
   class DumpOriginInfoTableHelper;
 
+  class LRUOriginEvictionPolicy;
+
   typedef QuotaDatabase::QuotaTableEntry QuotaTableEntry;
   typedef QuotaDatabase::OriginInfoTableEntry OriginInfoTableEntry;
   typedef std::vector<QuotaTableEntry> QuotaTableEntries;
@@ -409,8 +411,6 @@ class STORAGE_EXPORT QuotaManager
   void DidInitialize(int64* temporary_quota_override,
                      int64* desired_available_space,
                      bool success);
-  void DidGetLRUOrigin(const GURL* origin,
-                       bool success);
   void DidGetInitialTemporaryGlobalQuota(QuotaStatusCode status,
                                          int64 quota_unused);
   void DidInitializeTemporaryOriginsInfo(bool success);
@@ -434,7 +434,6 @@ class STORAGE_EXPORT QuotaManager
   scoped_refptr<base::SequencedTaskRunner> db_thread_;
   mutable scoped_ptr<QuotaDatabase> database_;
 
-  GetOriginCallback lru_origin_callback_;
   std::set<GURL> access_notified_origins_;
 
   QuotaClientList clients_;