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

chrome/browser/debugger/devtools_remote_listen_socket.cc

 // Copyright (c) 2009 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/browser/debugger/devtools_remote_listen_socket.h"
 
 #include "build/build_config.h"
 
 #include <stdlib.h>
 
@@ skipping 146 matching lines @@
   static const std::string kHandshakeString = "ChromeDevToolsHandshake";
   switch (state_) {
     case HANDSHAKE:
       if (protocol_field_.compare(kHandshakeString)) {
         state_ = INVALID;
       } else {
         Send(kHandshakeString, true);
       }
       break;
     case HEADERS: {
-      if (protocol_field_.size() > 0) {  // not end-of-headers
+      if (!protocol_field_.empty()) {  // not end-of-headers
         std::string::size_type colon_pos = protocol_field_.find_first_of(":");
         if (colon_pos == std::string::npos) {
           // TODO(apavlov): handle the error (malformed header)
         } else {
           const std::string header_name = protocol_field_.substr(0, colon_pos);
           std::string header_val = protocol_field_.substr(colon_pos + 1);
           header_map_[header_name] = header_val;
         }
       }
       break;
@@ skipping 74 matching lines @@
       send_buf += sent;
       len_left -= sent;
     }
     base::PlatformThread::YieldCurrentThread();
   }
 }
 
 void DevToolsRemoteListenSocket::Close() {
   ListenSocket::Close();
 }