Use ConvertUid{Pid}ToPath for all path generation

Consolidate into a single implementation.

Test: m
Change-Id: I0fc52db2d4b2973a74bad24c0a5f77384a559cee
diff --git a/libprocessgroup/task_profiles.h b/libprocessgroup/task_profiles.h
index 4284471..7e3c50d 100644
--- a/libprocessgroup/task_profiles.h
+++ b/libprocessgroup/task_profiles.h
@@ -252,3 +252,6 @@
     std::map<std::string, std::shared_ptr<TaskProfile>, std::less<>> profiles_;
     std::map<std::string, std::unique_ptr<IProfileAttribute>, std::less<>> attributes_;
 };
+
+std::string ConvertUidToPath(const char* root_cgroup_path, uid_t uid);
+std::string ConvertUidPidToPath(const char* root_cgroup_path, uid_t uid, pid_t pid);