Revert of Leak reports collect information about the last uptrend

components/metrics/leak_detector/call_stack_table.h

Index: components/metrics/leak_detector/call_stack_table.h
diff --git a/components/metrics/leak_detector/call_stack_table.h b/components/metrics/leak_detector/call_stack_table.h
index 5864ae740f3856ad11122243e6fe00e0e069ddc6..77a4b2a3ed717d882f44fb2403eb93b73315348d 100644
--- a/components/metrics/leak_detector/call_stack_table.h
+++ b/components/metrics/leak_detector/call_stack_table.h
@@ -48,21 +48,6 @@
   // must already be initialized with that number.
   void GetTopCallStacks(RankedSet* top_entries) const;
 
-  // Updates information about the last seen drop in the number of allocations
-  // and sets the |previous_count| for every stored call stack, both inside
-  // |entry_map_|. It should be called in the analysis phase, before the
-  // reports are generated, with |timestamp| describing current point in the
-  // timeline.
-  void UpdateLastDropInfo(size_t timestamp);
-
-  // Retrieves the change in timestamp and allocation count since the last
-  // observed drop in the number for allocations for the given call stack
-  // (or since the oldest kept record for the call stacks if there were no
-  // drops)
-  void GetLastUptrendInfo(
-      const CallStack* call_stack, size_t timestamp, size_t *timestamp_delta,
-      uint32_t *count_delta) const;
-
   const LeakAnalyzer& leak_analyzer() const { return leak_analyzer_; }
 
   size_t size() const { return entry_map_.size(); }
@@ -72,13 +57,6 @@
   uint32_t num_frees() const { return num_frees_; }
 
  private:
-  struct CallStackCountInfo {
-    uint32_t count, previous_count, last_drop_count;
-    size_t last_drop_timestamp;
-    CallStackCountInfo() : count(0), previous_count(0), last_drop_count(0),
-                           last_drop_timestamp(0) {}
-  };
-
   // Total number of allocs and frees in this table.
   uint32_t num_allocs_;
   uint32_t num_frees_;
@@ -92,7 +70,7 @@
   // Stores a mapping of each call stack to the number of recorded allocations
   // made from that call site.
   base::hash_map<const CallStack*,
-                 CallStackCountInfo,
+                 uint32_t,
                  StoredHash,
                  std::equal_to<const CallStack*>,
                  TableEntryAllocator> entry_map_;