profiler: cleanup unused alternate_timer code

components/metrics/profiler/profiler_metrics_provider.cc

Index: components/metrics/profiler/profiler_metrics_provider.cc
diff --git a/components/metrics/profiler/profiler_metrics_provider.cc b/components/metrics/profiler/profiler_metrics_provider.cc
index 9020e2d20878db755f7ca479491b7d5bffda3dd5..df64e293aee53f32b739a8c70055002b71f20842 100644
--- a/components/metrics/profiler/profiler_metrics_provider.cc
+++ b/components/metrics/profiler/profiler_metrics_provider.cc
@@ -85,9 +85,6 @@ ProfilerMetricsProvider::~ProfilerMetricsProvider() {
 
 void ProfilerMetricsProvider::ProvideGeneralMetrics(
     ChromeUserMetricsExtension* uma_proto) {
-  DCHECK_EQ(tracked_objects::TIME_SOURCE_TYPE_WALL_TIME,
-            tracked_objects::GetTimeSourceType());
-
   DCHECK_EQ(0, uma_proto->profiler_event_size());
 
   for (auto& event : profiler_events_cache_) {
@@ -110,12 +107,6 @@ void ProfilerMetricsProvider::RecordProfilerData(
   if (IsCellularLogicEnabled())
     return;
 
-  if (tracked_objects::GetTimeSourceType() !=
-      tracked_objects::TIME_SOURCE_TYPE_WALL_TIME) {
-    // We currently only support the default time source, wall clock time.
-    return;
-  }
-
   const bool new_phase = !ContainsKey(profiler_events_cache_, profiling_phase);
   ProfilerEventProto* profiler_event = &profiler_events_cache_[profiling_phase];