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

net/tools/flip_server/output_ordering.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 "net/tools/flip_server/output_ordering.h"
 
 #include "net/tools/flip_server/flip_config.h"
 #include "net/tools/flip_server/sm_connection.h"
 
 
@@ skipping 77 matching lines @@
   connection_->ReadyToSend();
 }
 
 void OutputOrdering::AddToOutputOrder(const MemCacheIter& mci) {
   if (ExistsInPriorityMaps(mci.stream_id))
     LOG(ERROR) << "OOps, already was inserted here?!";
 
   double think_time_in_s = server_think_time_in_s_;
   std::string x_server_latency =
     mci.file_data->headers->GetHeader("X-Server-Latency").as_string();
-  if (x_server_latency.size() != 0) {
+  if (!x_server_latency.empty()) {
     char* endp;
     double tmp_think_time_in_s = strtod(x_server_latency.c_str(), &endp);
     if (endp != x_server_latency.c_str() + x_server_latency.size()) {
       LOG(ERROR) << "Unable to understand X-Server-Latency of: "
                  << x_server_latency << " for resource: "
                  <<  mci.file_data->filename.c_str();
     } else {
       think_time_in_s = tmp_think_time_in_s;
     }
   }
@@ skipping 61 matching lines @@
   PriorityMapPointer& pmp = sitpmi->second;
   if (pmp.alarm_enabled)
     epoll_server_->UnregisterAlarm(pmp.alarm_token);
   else
     pmp.ring->erase(pmp.it);
   stream_ids_.erase(sitpmi);
 }
 
 }  // namespace net