Fix Mojo broker crash on Windows.

mojo/edk/system/child_broker_host.h

 // Copyright 2015 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.
 
 #ifndef MOJO_EDK_SYSTEM_CHILD_BROKER_HOST_H_
 #define MOJO_EDK_SYSTEM_CHILD_BROKER_HOST_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 30 matching lines @@
   base::ProcessId GetProcessId();
 
   // Sends a message to the child process to connect to |process_id| via |pipe|.
   void ConnectToProcess(base::ProcessId process_id, ScopedPlatformHandle pipe);
 
   // Sends a message to the child process that |pipe_id|'s other end is in
   // |process_id|. If the other end is in this parent process, |process_id| will
   // be 0.
   void ConnectMessagePipe(uint64_t pipe_id, base::ProcessId process_id);
 
+  // Sends a message to the child process informing it that the peer process has
+  // died before it could connect.
+  void PeerDied(uint64_t pipe_id);
+
   RoutedRawChannel* channel() { return child_channel_; }
 
  private:
   ~ChildBrokerHost() override;
 
   void InitOnIO(ScopedPlatformHandle parent_async_channel_handle);
 
   // RawChannel::Delegate implementation:
   void OnReadMessage(
       const MessageInTransit::View& message_view,
@@ skipping 38 matching lines @@
   std::vector<char> write_data_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ChildBrokerHost);
 };
 
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_CHILD_BROKER_HOST_H_