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

content/renderer/media/user_media_client_impl.cc

 // Copyright (c) 2012 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/renderer/media/user_media_client_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <utility>
@@ skipping 27 matching lines @@
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebUserGestureIndicator.h"
 
 namespace content {
 namespace {
 
 void CopyFirstString(const blink::StringConstraint& constraint,
                      std::string* destination) {
-  if (!constraint.exact().isEmpty())
+  if (!constraint.exact().empty())
     *destination = constraint.exact()[0].utf8();
 }
 
 bool FindDeviceId(const blink::WebVector<blink::WebString> candidates,
                   const MediaDeviceInfoArray& device_infos,
                   std::string* device_id) {
   for (const auto& candidate : candidates) {
     auto it = std::find_if(device_infos.begin(), device_infos.end(),
                            [&candidate](const MediaDeviceInfo& info) {
                              return info.device_id == candidate.utf8();
@@ skipping 1302 matching lines @@
     const blink::WebString& result_name) {
   // Check if we're waiting to be notified of this source.  If not, then we'll
   // ignore the notification.
   auto found = std::find(sources_waiting_for_callback_.begin(),
                          sources_waiting_for_callback_.end(), source);
   if (found != sources_waiting_for_callback_.end())
     OnTrackStarted(source, result, result_name);
 }
 
 }  // namespace content