Android: Fix potential null-ptr deref

content/browser/renderer_host/render_widget_host_view_android.cc

 // Copyright (c) 2012 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/renderer_host/render_widget_host_view_android.h"
 
 #include <android/bitmap.h>
 
 #include "base/android/build_info.h"
 #include "base/basictypes.h"
@@ skipping 140 matching lines @@
       base::Bind(&RenderWidgetHostViewAndroid::OnContextLost));
 }
 
 scoped_ptr<WebGraphicsContext3DCommandBufferImpl>
 GLHelperHolder::CreateContext3D() {
   BrowserGpuChannelHostFactory* factory =
       BrowserGpuChannelHostFactory::instance();
   scoped_refptr<GpuChannelHost> gpu_channel_host(factory->GetGpuChannel());
   // GLHelper can only be used in asynchronous APIs for postprocessing after
   // Browser Compositor operations (i.e. readback).
-  DCHECK(gpu_channel_host.get()) << "Illegal access to GPU channel at startup";
-  if (gpu_channel_host->IsLost()) {
+  if (!gpu_channel_host.get()) {
     // The Browser Compositor is in charge of reestablishing the channel.
     return scoped_ptr<WebGraphicsContext3DCommandBufferImpl>();
   }
 
   blink::WebGraphicsContext3D::Attributes attrs;
   attrs.shareResources = true;
   GURL url("chrome://gpu/RenderWidgetHostViewAndroid");
   static const size_t kBytesPerPixel = 4;
   gfx::DeviceDisplayInfo display_info;
   size_t full_screen_texture_size_in_bytes = display_info.GetDisplayHeight() *
@@ skipping 1739 matching lines @@
   results->orientationAngle = display.RotationAsDegree();
   results->orientationType =
       RenderWidgetHostViewBase::GetOrientationTypeForMobile(display);
   gfx::DeviceDisplayInfo info;
   results->depth = info.GetBitsPerPixel();
   results->depthPerComponent = info.GetBitsPerComponent();
   results->isMonochrome = (results->depthPerComponent == 0);
 }
 
 } // namespace content