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

chrome/browser/sync/glue/data_type_manager_impl.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 <algorithm>
 #include <functional>
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/task.h"
@@ skipping 208 matching lines @@
   }
 
   // Pause the sync backend before starting the data types.
   state_ = PAUSE_PENDING;
   PauseSyncer();
 }
 
 void DataTypeManagerImpl::StartNextType() {
   // If there are any data types left to start, start the one at the
   // front of the list.
-  if (needs_start_.size() > 0) {
+  if (!needs_start_.empty()) {
     current_dtc_ = needs_start_[0];
     VLOG(1) << "Starting " << current_dtc_->name();
     current_dtc_->Start(
         NewCallback(this, &DataTypeManagerImpl::TypeStartCallback));
     return;
   }
 
   // If no more data types need starting, we're done.  Resume the sync
   // backend to finish.
   DCHECK_EQ(state_, CONFIGURING);
@@ skipping 236 matching lines @@
   AddObserver(NotificationType::SYNC_PAUSED);
   pause_pending_ = true;
   if (!backend_->RequestPause()) {
     pause_pending_ = false;
     RemoveObserver(NotificationType::SYNC_PAUSED);
     FinishStopAndNotify(UNRECOVERABLE_ERROR);
   }
 }
 
 }  // namespace browser_sync