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

net/http/http_pipelined_host.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 NET_HTTP_HTTP_PIPELINED_HOST_H_
 #define NET_HTTP_HTTP_PIPELINED_HOST_H_
 
 #include "net/base/host_port_pair.h"
 #include "net/base/net_export.h"
 #include "net/http/http_pipelined_connection.h"
@@ skipping 12 matching lines @@
 class ProxyInfo;
 struct SSLConfig;
 
 // Manages all of the pipelining state for specific host with active pipelined
 // HTTP requests. Manages connection jobs, constructs pipelined streams, and
 // assigns requests to the least loaded pipelined connection.
 class NET_EXPORT_PRIVATE HttpPipelinedHost {
  public:
   class NET_EXPORT_PRIVATE Key {
    public:
-    Key(const HostPortPair& origin);
+    explicit Key(const HostPortPair& origin);
 
     // The host and port associated with this key.
     const HostPortPair& origin() const { return origin_; }
 
     bool operator<(const Key& rhs) const;
 
    private:
     const HostPortPair origin_;
   };
 
@@ skipping 49 matching lines @@
   virtual const Key& GetKey() const = 0;
 
   // Creates a Value summary of this host's pipelines. Caller assumes
   // ownership of the returned Value.
   virtual base::Value* PipelineInfoToValue() const = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_PIPELINED_HOST_H_