Revert of Make lost context and error message callbacks on GpuControl go to client

gpu/command_buffer/tests/gl_manager.cc

Index: gpu/command_buffer/tests/gl_manager.cc
diff --git a/gpu/command_buffer/tests/gl_manager.cc b/gpu/command_buffer/tests/gl_manager.cc
index ce9fd3ccd7f2c5f83b3c34f2109e1b95b960ee33..95778c9cb47fde802cd155e5cffd2260d664cda7 100644
--- a/gpu/command_buffer/tests/gl_manager.cc
+++ b/gpu/command_buffer/tests/gl_manager.cc
@@ -511,10 +511,6 @@
   return executor_->SetGetBuffer(transfer_buffer_id);
 }
 
-void GLManager::SetGpuControlClient(GpuControlClient*) {
-  // The client is not currently called, so don't store it.
-}
-
 Capabilities GLManager::GetCapabilities() {
   return decoder_->GetCapabilities();
 }