Call ScheduleShutdownIfIdle() from FinishCollection()

This Cl also corrects the indent in FinishCollection().

Bug: 851163
Change-Id: I77b255b2f9191979bca02f5453d54fc8bd1e36ee
Reviewed-on: https://chromium-review.googlesource.com/1101406Reviewed-by: Mike Wittman <wittman@chromium.org>
Commit-Queue: Xi Cheng <chengx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567403}

base/profiler/stack_sampling_profiler.cc

@@ -506,6 +506,8 @@ void StackSamplingProfiler::SamplingThread::FinishCollection(
 
   // Signal that this collection is finished.
   finished->Signal();
+
+  ScheduleShutdownIfIdle();
 }
 
 void StackSamplingProfiler::SamplingThread::ScheduleShutdownIfIdle() {
@@ -567,7 +569,6 @@ void StackSamplingProfiler::SamplingThread::RemoveCollectionTask(
   DCHECK_EQ(1U, count);
 
   FinishCollection(collection.get());
-  ScheduleShutdownIfIdle();
 }
 
 void StackSamplingProfiler::SamplingThread::RecordSampleTask(
@@ -621,7 +622,6 @@ void StackSamplingProfiler::SamplingThread::RecordSampleTask(
 
   // All capturing has completed so finish the collection.
   FinishCollection(collection);
-  ScheduleShutdownIfIdle();
 }
 
 void StackSamplingProfiler::SamplingThread::ShutdownTask(int add_events) {