content: Don't keep requesting the GpuChannelHost during shutdown.

content/browser/renderer_host/context_provider_factory_impl_android.cc

Index: content/browser/renderer_host/context_provider_factory_impl_android.cc
diff --git a/content/browser/renderer_host/context_provider_factory_impl_android.cc b/content/browser/renderer_host/context_provider_factory_impl_android.cc
index d3db9665c284e13e36f55d4cc0367b09b118cf8f..40cc97c1a4a271837d53117c4d92b6822012aae8 100644
--- a/content/browser/renderer_host/context_provider_factory_impl_android.cc
+++ b/content/browser/renderer_host/context_provider_factory_impl_android.cc
@@ -235,6 +235,11 @@ void ContextProviderFactoryImpl::OnGpuChannelEstablished(
     scoped_refptr<gpu::GpuChannelHost> gpu_channel) {
   establish_gpu_channel_timeout_.Stop();
 
+  // This should happen only during shutdown. So early out instead of queuing
+  // more requests with the factory.
+  if (!gpu_channel)
+    return;
+
   // We can queue the Gpu Channel initialization requests multiple times as
   // we get context requests. So we might have already handled any pending
   // requests when this callback runs.