gpu: Replace GpuMsg_Finalize ipc with equivalent mojom api

content/common/gpu_host_messages.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Multiply-included message file, hence no include guard here, but see below
 // for a much smaller-than-usual include guard section.
 
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/common/establish_channel_params.h"
@@ skipping 71 matching lines @@
   IPC_STRUCT_TRAITS_MEMBER(enable_gpu_service_logging)
   IPC_STRUCT_TRAITS_MEMBER(enable_gpu_service_tracing)
   IPC_STRUCT_TRAITS_MEMBER(enable_es3_apis)
   IPC_STRUCT_TRAITS_MEMBER(use_passthrough_cmd_decoder)
 IPC_STRUCT_TRAITS_END()
 
 //------------------------------------------------------------------------------
 // GPU Messages
 // These are messages from the browser to the GPU process.
 
-// Tells the GPU process to shutdown itself.
-IPC_MESSAGE_CONTROL0(GpuMsg_Finalize)
-
 // Tells the GPU process to create a new gpu memory buffer.
 IPC_MESSAGE_CONTROL1(GpuMsg_CreateGpuMemoryBuffer,
                      GpuMsg_CreateGpuMemoryBuffer_Params)
 
 // Tells the GPU process to destroy buffer.
 IPC_MESSAGE_CONTROL3(GpuMsg_DestroyGpuMemoryBuffer,
                      gfx::GpuMemoryBufferId, /* id */
                      int32_t,                /* client_id */
                      gpu::SyncToken /* sync_token */)
 
@@ skipping 23 matching lines @@
                      gpu::GPUInfo /* GPU logging stats */)
 
 // Message from GPU to add a GPU log message to the about:gpu page.
 IPC_MESSAGE_CONTROL3(GpuHostMsg_OnLogMessage,
                      int /*severity*/,
                      std::string /* header */,
                      std::string /* message */)
 
 // Sent by the GPU process to indicate that a fields trial has been activated.
 IPC_MESSAGE_CONTROL1(GpuHostMsg_FieldTrialActivated, std::string /* name */)