Null check content view core before using it.

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index af88a1b5ec0568e78b2632ca7d2f6db0b6eb94e4..1e0ff6dc22f3011143eca7c8a68dde4e423c4cb0 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -1116,6 +1116,10 @@ void RenderWidgetHostViewAndroid::SynchronousFrameMetadata(
   OnFrameMetadataUpdated(frame_metadata);
   ComputeContentsSize(frame_metadata);
 
+  // Content view core may possibly be destructed at this time.

[boliu, 2014/10/27 22:19:05]

No need for comment

[hush (inactive), 2014/10/27 22:24:03]

Done.

+  if (content_view_core_ == NULL)

[boliu, 2014/10/27 22:19:05]

if (!content_view_core_)

And I think you can put it at the top of the method

[hush (inactive), 2014/10/27 22:24:03]

Done.

+    return;
+
   // DevTools ScreenCast support for Android WebView.
   WebContents* web_contents = content_view_core_->GetWebContents();
   if (DevToolsAgentHost::HasFor(web_contents)) {