Add missing (and remove superfluous) 'explicit' from constructors.

ipc/ipc_channel_proxy.h

 // Copyright (c) 2012 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 IPC_IPC_CHANNEL_PROXY_H_
 #define IPC_IPC_CHANNEL_PROXY_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
@@ skipping 170 matching lines @@
   // Calls through to the underlying channel's methods.
   int GetClientFileDescriptor();
   int TakeClientFileDescriptor();
   bool GetClientEuid(uid_t* client_euid) const;
 #endif  // defined(OS_POSIX)
 
  protected:
   class Context;
   // A subclass uses this constructor if it needs to add more information
   // to the internal state.
-  ChannelProxy(Context* context);
+  explicit ChannelProxy(Context* context);
 
   // Used internally to hold state that is referenced on the IPC thread.
   class Context : public base::RefCountedThreadSafe<Context>,
                   public Listener {
    public:
     Context(Listener* listener, base::SingleThreadTaskRunner* ipc_thread);
     void ClearIPCTaskRunner();
     base::SingleThreadTaskRunner* ipc_task_runner() const {
       return ipc_task_runner_;
     }
@@ skipping 82 matching lines @@
 
   OutgoingMessageFilter* outgoing_message_filter_;
 
   // Whether the channel has been initialized.
   bool did_init_;
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_PROXY_H_