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

gpu/ipc/client/command_buffer_proxy_impl.cc

Index: gpu/ipc/client/command_buffer_proxy_impl.cc
diff --git a/gpu/ipc/client/command_buffer_proxy_impl.cc b/gpu/ipc/client/command_buffer_proxy_impl.cc
index daeaa0b8936ade41ca74211a1cd28ca744507a6a..714b4dcb9e3423ce1e3f4747e90dee654a897195 100644
--- a/gpu/ipc/client/command_buffer_proxy_impl.cc
+++ b/gpu/ipc/client/command_buffer_proxy_impl.cc
@@ -608,23 +608,13 @@
   signal_tasks_.insert(std::make_pair(signal_id, callback));
 }
 
-void CommandBufferProxyImpl::TakeFrontBuffer(const gpu::Mailbox& mailbox) {
-  CheckLock();
-  if (last_state_.error != gpu::error::kNoError)
-    return;
-
-  Send(new GpuCommandBufferMsg_TakeFrontBuffer(route_id_, mailbox));
-}
-
-void CommandBufferProxyImpl::ReturnFrontBuffer(const gpu::Mailbox& mailbox,
-                                               const gpu::SyncToken& sync_token,
-                                               bool is_lost) {
-  CheckLock();
-  if (last_state_.error != gpu::error::kNoError)
-    return;
-
-  Send(new GpuCommandBufferMsg_WaitSyncToken(route_id_, sync_token));
-  Send(new GpuCommandBufferMsg_ReturnFrontBuffer(route_id_, mailbox, is_lost));
+bool CommandBufferProxyImpl::ProduceFrontBuffer(const gpu::Mailbox& mailbox) {
+  CheckLock();
+  if (last_state_.error != gpu::error::kNoError)
+    return false;
+
+  Send(new GpuCommandBufferMsg_ProduceFrontBuffer(route_id_, mailbox));
+  return true;
 }
 
 gpu::error::Error CommandBufferProxyImpl::GetLastError() {