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

net/websockets/websocket_job.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 "net/websockets/websocket_job.h"
 
 #include <algorithm>
 
 #include "base/lazy_instance.h"
 #include "base/string_tokenizer.h"
@@ skipping 216 matching lines @@
   std::string received_data;
   receive_frame_handler_->AppendData(data, len);
   // Don't buffer receiving data for now.
   // TODO(ukai): fix performance of WebSocketFrameHandler.
   while (receive_frame_handler_->UpdateCurrentBuffer(false) > 0) {
     received_data +=
         std::string(receive_frame_handler_->GetCurrentBuffer()->data(),
                     receive_frame_handler_->GetCurrentBufferSize());
     receive_frame_handler_->ReleaseCurrentBuffer();
   }
-  if (delegate_ && received_data.size() > 0)
+  if (delegate_ && !received_data.empty())
       delegate_->OnReceivedData(
           socket, received_data.data(), received_data.size());
 }
 
 void WebSocketJob::OnClose(SocketStream* socket) {
   state_ = CLOSED;
   WebSocketThrottle::GetInstance()->RemoveFromQueue(this);
   WebSocketThrottle::GetInstance()->WakeupSocketIfNecessary();
 
   scoped_refptr<WebSocketJob> protect(this);
@@ skipping 255 matching lines @@
       socket_->Close();
     return;
   }
   current_buffer_ = new DrainableIOBuffer(
       send_frame_handler_->GetCurrentBuffer(),
       send_frame_handler_->GetCurrentBufferSize());
   socket_->SendData(current_buffer_->data(), current_buffer_->BytesRemaining());
 }
 
 }  // namespace net