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

chrome/browser/debugger/inspectable_tab_proxy.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/browser/debugger/inspectable_tab_proxy.h"
 
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/debugger/debugger_remote_service.h"
@@ skipping 87 matching lines @@
 DevToolsClientHost* InspectableTabProxy::NewClientHost(
     int32 id,
     DebuggerRemoteService* service) {
   DevToolsClientHostImpl* client_host =
       new DevToolsClientHostImpl(id, service, &id_to_client_host_map_);
   id_to_client_host_map_[id] = client_host;
   return client_host;
 }
 
 void InspectableTabProxy::OnRemoteDebuggerDetached() {
-  while (id_to_client_host_map_.size() > 0) {
+  while (!id_to_client_host_map_.empty()) {
     IdToClientHostMap::iterator it = id_to_client_host_map_.begin();
     it->second->debugger_remote_service()->DetachFromTab(
         base::IntToString(it->first), NULL);
   }
 }