gpu: Reduce direct use of BrowserGpuMemoryBufferManager

content/browser/gpu/browser_gpu_channel_host_factory.cc

Index: content/browser/gpu/browser_gpu_channel_host_factory.cc
diff --git a/content/browser/gpu/browser_gpu_channel_host_factory.cc b/content/browser/gpu/browser_gpu_channel_host_factory.cc
index 9c77f8abec4ec198d70b8f60d9b8688aa16528bc..3ce2724f2e4fbc5906ac62e6b57b94c68f0db83d 100644
--- a/content/browser/gpu/browser_gpu_channel_host_factory.cc
+++ b/content/browser/gpu/browser_gpu_channel_host_factory.cc
@@ -174,14 +174,6 @@ void BrowserGpuChannelHostFactory::EstablishRequest::Cancel() {
   finished_ = true;
 }
 
-void BrowserGpuChannelHostFactory::CloseChannel() {
-  DCHECK(instance_);
-  if (instance_->gpu_channel_) {
-    instance_->gpu_channel_->DestroyChannel();
-    instance_->gpu_channel_ = nullptr;
-  }
-}
-
 void BrowserGpuChannelHostFactory::Initialize(bool establish_gpu_channel) {
   DCHECK(!instance_);
   instance_ = new BrowserGpuChannelHostFactory();