Fix tracing C++ library

mojo/common/trace_provider_impl.cc

 // Copyright 2015 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 "mojo/common/trace_provider_impl.h"
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
@@ skipping 69 matching lines @@
       base::Callback<void(const scoped_refptr<base::RefCountedString>&,
                           bool)>());
 }
 
 void TraceProviderImpl::SendChunk(
     const scoped_refptr<base::RefCountedString>& events_str,
     bool has_more_events) {
   DCHECK(recorder_);
   // The string will be empty if an error eccured or there were no trace
   // events. Empty string is not a valid chunk to record so skip in this case.
-  if (events_str->data().empty()) {
+  if (!events_str->data().empty()) {
     recorder_->Record(mojo::String(events_str->data()));
   }
   if (!has_more_events) {
     recorder_.reset();
   }
 }
 
 }  // namespace mojo