[Merge to 2743] Revert "[Reland 2] Pepper takes ownership of a mailbox before passing it to the tex…

gpu/ipc/client/command_buffer_proxy_impl.h

Index: gpu/ipc/client/command_buffer_proxy_impl.h
diff --git a/gpu/ipc/client/command_buffer_proxy_impl.h b/gpu/ipc/client/command_buffer_proxy_impl.h
index d4fe36e7227bb97b9db47e762434842b51d68e71..41ea4eaa2f9c148755e1aa4fc51095c482b68ef0 100644
--- a/gpu/ipc/client/command_buffer_proxy_impl.h
+++ b/gpu/ipc/client/command_buffer_proxy_impl.h
@@ -137,10 +137,7 @@ class GPU_EXPORT CommandBufferProxyImpl
                        const base::Closure& callback) override;
   bool CanWaitUnverifiedSyncToken(const gpu::SyncToken* sync_token) override;
 
-  void TakeFrontBuffer(const gpu::Mailbox& mailbox);
-  void ReturnFrontBuffer(const gpu::Mailbox& mailbox,
-                         const gpu::SyncToken& sync_token,
-                         bool is_lost);
+  bool ProduceFrontBuffer(const gpu::Mailbox& mailbox);
 
   void AddDeletionObserver(DeletionObserver* observer);
   void RemoveDeletionObserver(DeletionObserver* observer);