Constructor without callback added to ProfilerMetricsProvider.

components/metrics/profiler/profiler_metrics_provider.cc

 // Copyright 2014 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 "components/metrics/profiler/profiler_metrics_provider.h"
 
 #include <ctype.h>
 #include <string>
 #include <vector>
 
@@ skipping 99 matching lines @@
 // Returns true if the user is assigned to the experiment group for enabled
 // cellular uploads.
 bool IsCellularEnabledByExperiment() {
   const std::string group_name =
       base::FieldTrialList::FindFullName("UMA_EnableCellularLogUpload");
   return group_name == "Enabled";
 }
 
 }  // namespace
 
+ProfilerMetricsProvider::ProfilerMetricsProvider() : has_profiler_data_(false) {
+}
+
 ProfilerMetricsProvider::ProfilerMetricsProvider(
     const base::Callback<void(bool*)>& cellular_callback)
     : has_profiler_data_(false), cellular_callback_(cellular_callback) {
 }
 
 ProfilerMetricsProvider::~ProfilerMetricsProvider() {
 }
 
 void ProfilerMetricsProvider::ProvideGeneralMetrics(
     ChromeUserMetricsExtension* uma_proto) {
@@ skipping 21 matching lines @@
   }
 
   has_profiler_data_ = true;
   profiler_event_cache_.set_profile_type(ProfilerEventProto::STARTUP_PROFILE);
   profiler_event_cache_.set_time_source(ProfilerEventProto::WALL_CLOCK_TIME);
   WriteProfilerData(process_data, process_type, &profiler_event_cache_);
 }
 
 bool ProfilerMetricsProvider::IsCellularConnection() {
   bool is_cellular = false;
-  // For android get current connection type from NetworkMetricsProvider.
+// For android get current connection type from NetworkMetricsProvider if the
+// callback exists.
 #if defined(OS_ANDROID)
   if (!cellular_callback_.is_null())
     cellular_callback_.Run(&is_cellular);
 #endif
   return is_cellular;
 }
 
 }  // namespace metrics