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

gpu/gles2_conform_support/egl/display.cc

Index: gpu/gles2_conform_support/egl/display.cc
diff --git a/gpu/gles2_conform_support/egl/display.cc b/gpu/gles2_conform_support/egl/display.cc
index a19718b4c35e8c5a0030314a4d2a6e6eeac3d857..0223a86fb1adb36494f49a713ada50c7aeacf890 100644
--- a/gpu/gles2_conform_support/egl/display.cc
+++ b/gpu/gles2_conform_support/egl/display.cc
@@ -322,10 +322,6 @@
   return true;
 }
 
-void Display::SetGpuControlClient(gpu::GpuControlClient*) {
-  // The client is not currently called, so don't store it.
-}
-
 gpu::Capabilities Display::GetCapabilities() {
   return decoder_->GetCapabilities();
 }