Revert of [Reland 1] Pepper takes ownership of a mailbox before passing it to the texture layer.

components/mus/gles2/command_buffer_impl.cc

Index: components/mus/gles2/command_buffer_impl.cc
diff --git a/components/mus/gles2/command_buffer_impl.cc b/components/mus/gles2/command_buffer_impl.cc
index 86fb239829c8efc9c63309be4f1dc121b0ac4b6d..20018b111ddb3b76493cde55e7592b7d3d98b300 100644
--- a/components/mus/gles2/command_buffer_impl.cc
+++ b/components/mus/gles2/command_buffer_impl.cc
@@ -137,12 +137,7 @@
   NOTIMPLEMENTED();
 }
 
-void CommandBufferImpl::TakeFrontBuffer(const gpu::Mailbox& mailbox) {
-  NOTIMPLEMENTED();
-}
-
-void CommandBufferImpl::ReturnFrontBuffer(const gpu::Mailbox& mailbox,
-                                          bool is_lost) {
+void CommandBufferImpl::ProduceFrontBuffer(const gpu::Mailbox& mailbox) {
   NOTIMPLEMENTED();
 }