Remove unnecesary usage of RefPtr and PassRefPtr of DatabaseContext.

Source/modules/webdatabase/DatabaseServer.h

Index: Source/modules/webdatabase/DatabaseServer.h
diff --git a/Source/modules/webdatabase/DatabaseServer.h b/Source/modules/webdatabase/DatabaseServer.h
index 4119492089e66b3c6da23e8073cd19129b9a26ee..1a520d8870559522f07a47da7a606bbe7f3d3a60 100644
--- a/Source/modules/webdatabase/DatabaseServer.h
+++ b/Source/modules/webdatabase/DatabaseServer.h
@@ -38,7 +38,7 @@ public:
 
     virtual String fullPathForDatabase(SecurityOrigin*, const String& name, bool createIfDoesNotExist) OVERRIDE;
 
-    virtual PassRefPtrWillBeRawPtr<DatabaseBackendBase> openDatabase(RefPtr<DatabaseContext>&, DatabaseType,
+    virtual PassRefPtrWillBeRawPtr<DatabaseBackendBase> openDatabase(DatabaseContext*, DatabaseType,
         const String& name, const String& expectedVersion, const String& displayName, unsigned long estimatedSize,
         bool setVersionInNewDatabase, DatabaseError&, String& errorMessage) OVERRIDE;
 
@@ -47,7 +47,7 @@ public:
     virtual void interruptAllDatabasesForContext(const DatabaseContext*) OVERRIDE;
 
 protected:
-    PassRefPtrWillBeRawPtr<DatabaseBackendBase> createDatabase(RefPtr<DatabaseContext>&, DatabaseType,
+    PassRefPtrWillBeRawPtr<DatabaseBackendBase> createDatabase(DatabaseContext*, DatabaseType,
         const String& name, const String& expectedVersion, const String& displayName, unsigned long estimatedSize,
         bool setVersionInNewDatabase, DatabaseError&, String& errorMessage);
 };