Change other usages of .size() to .empty() when applicable.

chrome/common/unix_domain_socket_posix.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/common/unix_domain_socket_posix.h"
 
 #include <errno.h>
 #include <unistd.h>
 #include <sys/uio.h>
 #include <sys/socket.h>
@@ skipping 109 matching lines @@
     return -1;
   }
   close(fds[1]);
 
   fd_vector.clear();
   const ssize_t reply_len = RecvMsg(fds[0], reply, max_reply_len, &fd_vector);
   close(fds[0]);
   if (reply_len == -1)
     return -1;
 
-  if ((fd_vector.size() > 0 && result_fd == NULL) || fd_vector.size() > 1) {
+  if ((!fd_vector.empty() && result_fd == NULL) || fd_vector.size() > 1) {
     for (std::vector<int>::const_iterator
          i = fd_vector.begin(); i != fd_vector.end(); ++i) {
       close(*i);
     }
 
     NOTREACHED();
 
     return -1;
   }
 
-  if (result_fd) {
-    if (fd_vector.empty()) {
-      *result_fd = -1;
-    } else {
-      *result_fd = fd_vector[0];
-    }
-  }
+  if (result_fd)
+    *result_fd = fd_vector.empty() ? -1 : fd_vector[0];
 
   return reply_len;
 }