Remove IsCollectionEnabled method which is unused

Bug: 851163
Change-Id: Ie02bf11865d1f84254d14723dfd55e26c1987609
Reviewed-on: https://chromium-review.googlesource.com/1256012
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595739}

components/metrics/call_stack_profile_metrics_provider.cc

@@ -86,9 +86,6 @@ class PendingProfiles {
   // provided to future invocations of CollectProfilesIfCollectionEnabled.
   void SetCollectionEnabled(bool enabled);
 
-  // True if profiles are being collected.
-  bool IsCollectionEnabled() const;
-
   // Adds |profile| to the list of profiles if collection is enabled; it is
   // not const& because it must be passed with std::move.
   void CollectProfilesIfCollectionEnabled(ProfileState profile);
@@ -147,11 +144,6 @@ void PendingProfiles::SetCollectionEnabled(bool enabled) {
   }
 }
 
-bool PendingProfiles::IsCollectionEnabled() const {
-  base::AutoLock scoped_lock(lock_);
-  return collection_enabled_;
-}
-
 void PendingProfiles::CollectProfilesIfCollectionEnabled(ProfileState profile) {
   base::AutoLock scoped_lock(lock_);