Replaced is_null() with is_valid in SurfaceId and related classes.

content/browser/frame_host/render_widget_host_view_child_frame_unittest.cc

 // Copyright 2014 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.
 
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 162 matching lines @@
   gfx::Rect view_rect(view_size);
   float scale_factor = 1.f;
 
   view_->SetSize(view_size);
   view_->Show();
 
   view_->OnSwapCompositorFrame(
       0, CreateDelegatedFrame(scale_factor, view_size, view_rect));
 
   cc::SurfaceId id = GetSurfaceId();
-  if (!id.is_null()) {
+  if (id.is_valid()) {
 #if !defined(OS_ANDROID)
     ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
     cc::SurfaceManager* manager = factory->GetSurfaceManager();
     cc::Surface* surface = manager->GetSurfaceForId(id);
     EXPECT_TRUE(surface);
     // There should be a SurfaceSequence created by the RWHVChildFrame.
     EXPECT_EQ(1u, surface->GetDestructionDependencyCount());
 #endif
 
     // Surface ID should have been passed to CrossProcessFrameConnector to
     // be sent to the embedding renderer.
     EXPECT_EQ(id, test_frame_connector_->last_surface_id_received_);
     EXPECT_EQ(view_size, test_frame_connector_->last_frame_size_received_);
     EXPECT_EQ(scale_factor, test_frame_connector_->last_scale_factor_received_);
   }
 }
 
 }  // namespace content