ui: Cleanup class/struct forward declarations

components/metrics/call_stack_profile_metrics_provider.cc

Index: components/metrics/call_stack_profile_metrics_provider.cc
diff --git a/components/metrics/call_stack_profile_metrics_provider.cc b/components/metrics/call_stack_profile_metrics_provider.cc
index 9f323fdc28a48f2708826ddd768e1a8118dc8367..6e320c82067651a5cf5390b6de17656d3ca8e9fa 100644
--- a/components/metrics/call_stack_profile_metrics_provider.cc
+++ b/components/metrics/call_stack_profile_metrics_provider.cc
@@ -89,7 +89,6 @@ class PendingProfiles {
  public:
   static PendingProfiles* GetInstance();
 
-  void Clear();
   void Swap(std::vector<ProfilesState>* profiles);
 
   // Enables the collection of profiles by CollectProfilesIfCollectionEnabled if
@@ -136,11 +135,6 @@ PendingProfiles* PendingProfiles::GetInstance() {
                          base::LeakySingletonTraits<PendingProfiles>>::get();
 }
 
-void PendingProfiles::Clear() {
-  base::AutoLock scoped_lock(lock_);
-  profiles_.clear();
-}
-
 void PendingProfiles::Swap(std::vector<ProfilesState>* profiles) {
   base::AutoLock scoped_lock(lock_);
   profiles_.swap(*profiles);