Replace usage of WebVector::isEmpty with WebVector::empty().

content/child/webmessageportchannel_impl.cc

 // Copyright (c) 2011 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 "content/child/webmessageportchannel_impl.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 82 matching lines @@
                    base::Unretained(client)));
   } else {
     port_.ClearCallback();
   }
 }
 
 void WebMessagePortChannelImpl::postMessage(
     const WebString& encoded_message,
     WebMessagePortChannelArray channels) {
   std::vector<MessagePort> ports;
-  if (!channels.isEmpty()) {
+  if (!channels.empty()) {
     ports.resize(channels.size());
     for (size_t i = 0; i < channels.size(); ++i) {
       ports[i] = static_cast<WebMessagePortChannelImpl*>(channels[i].get())->
           ReleaseMessagePort();
     }
   }
   port_.PostMessage(encoded_message.utf16(), std::move(ports));
 }
 
 bool WebMessagePortChannelImpl::tryGetMessage(
     WebString* encoded_message,
     WebMessagePortChannelArray& channels) {
   base::string16 buffer;
   std::vector<MessagePort> ports;
   if (!port_.GetMessage(&buffer, &ports))
     return false;
 
   *encoded_message = WebString::fromUTF16(buffer);
 
   if (!ports.empty()) {
     channels = WebMessagePortChannelArray(ports.size());
     for (size_t i = 0; i < ports.size(); ++i)
       channels[i] = base::MakeUnique<WebMessagePortChannelImpl>(ports[i]);
   }
   return true;
 }
 
 }  // namespace content