Remove base::SharedMemory::ShareToProcess.

chrome/renderer/pepper/pepper_shared_memory_message_filter.cc

 // Copyright (c) 2013 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.
 
 #include "chrome/renderer/pepper/pepper_shared_memory_message_filter.h"
 
 #include <memory>
 
 #include "base/memory/shared_memory.h"
 #include "base/process/process_handle.h"
@@ skipping 31 matching lines @@
     uint32_t size,
     int* host_handle_id,
     ppapi::proxy::SerializedHandle* plugin_handle) {
   plugin_handle->set_null_shmem();
   *host_handle_id = -1;
   std::unique_ptr<base::SharedMemory> shm(
       content::RenderThread::Get()->HostAllocateSharedMemoryBuffer(size));
   if (!shm.get())
     return;
 
-  base::SharedMemoryHandle host_shm_handle;
-  shm->ShareToProcess(base::GetCurrentProcessHandle(), &host_shm_handle);
+  // TODO(erikchen): This appears to sometimes leak the SharedMemoryHandle.
+  // https://crbug.com/640840.
+  base::SharedMemoryHandle host_shm_handle = shm->handle().Duplicate();
   *host_handle_id =
       content::PepperPluginInstance::Get(instance)
           ->GetVarTracker()
           ->TrackSharedMemoryHandle(instance, host_shm_handle, size);
 
   // We set auto_close to false since we need our file descriptor to
   // actually be duplicated on linux. The shared memory destructor will
   // close the original handle for us.
   plugin_handle->set_shmem(
       host_->ShareSharedMemoryHandleWithRemote(host_shm_handle), size);
 }