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

net/socket/transport_client_socket_pool_unittest.cc

Index: net/socket/transport_client_socket_pool_unittest.cc
diff --git a/net/socket/transport_client_socket_pool_unittest.cc b/net/socket/transport_client_socket_pool_unittest.cc
index aefe79cfedab00fd1b07074046a8c2b147b4fb7d..7ccfe4e7e46998e4c4ada189533baf6b1f8f4a43 100644
--- a/net/socket/transport_client_socket_pool_unittest.cc
+++ b/net/socket/transport_client_socket_pool_unittest.cc
@@ -47,7 +47,7 @@ void SetIPv6Address(IPEndPoint* address) {
 
 class MockClientSocket : public StreamSocket {
  public:
-  MockClientSocket(const AddressList& addrlist)
+  explicit MockClientSocket(const AddressList& addrlist)
       : connected_(false),
         addrlist_(addrlist) {}
 
@@ -119,7 +119,8 @@ class MockClientSocket : public StreamSocket {
 
 class MockFailingClientSocket : public StreamSocket {
  public:
-  MockFailingClientSocket(const AddressList& addrlist) : addrlist_(addrlist) {}
+  explicit MockFailingClientSocket(const AddressList& addrlist)
+      : addrlist_(addrlist) {}
 
   // StreamSocket implementation.
   virtual int Connect(const CompletionCallback& callback) {