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

ipc/ipc_channel_posix_unittest.cc

 // 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.
 
 // These tests are POSIX only.
 
 #include "ipc/ipc_channel_posix.h"
 
 #include <fcntl.h>
 #include <sys/socket.h>
@@ skipping 20 matching lines @@
  public:
   enum STATUS {
     DISCONNECTED,
     MESSAGE_RECEIVED,
     CHANNEL_ERROR,
     CONNECTED,
     DENIED,
     LISTEN_ERROR
   };
 
-  IPCChannelPosixTestListener(bool quit_only_on_message)
+  explicit IPCChannelPosixTestListener(bool quit_only_on_message)
       : status_(DISCONNECTED), quit_only_on_message_(quit_only_on_message) {}
 
   virtual ~IPCChannelPosixTestListener() {}
 
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE {
     EXPECT_EQ(message.type(), kQuitMessage);
     status_ = MESSAGE_RECEIVED;
     QuitRunLoop();
     return true;
   }
@@ skipping 366 matching lines @@
   // it.
   bool connected = channel.Connect();
   if (connected) {
     IPCChannelPosixTest::SpinRunLoop(TestTimeouts::action_max_timeout());
     EXPECT_EQ(IPCChannelPosixTestListener::CHANNEL_ERROR, listener.status());
   } else {
     EXPECT_EQ(IPCChannelPosixTestListener::DISCONNECTED, listener.status());
   }
   return 0;
 }