Fix element array bug

gpu/command_buffer/client/vertex_array_object_manager.cc

Index: gpu/command_buffer/client/vertex_array_object_manager.cc
diff --git a/gpu/command_buffer/client/vertex_array_object_manager.cc b/gpu/command_buffer/client/vertex_array_object_manager.cc
index 4c76fb56899d7651c8acdf82228ba1e4364abfbc..65eb7c7e40cbc89e531f6373770fb7ee0f9ae7cf 100644
--- a/gpu/command_buffer/client/vertex_array_object_manager.cc
+++ b/gpu/command_buffer/client/vertex_array_object_manager.cc
@@ -209,6 +209,9 @@ void VertexArrayObject::UnbindBuffer(GLuint id) {
       }
     }
   }
+  if (bound_element_array_buffer_id_ == id) {
+    bound_element_array_buffer_id_ = 0;
+  }
 }
 
 bool VertexArrayObject::BindElementArray(GLuint id) {