[tracing] Use EstimateMemoryUsage() in deduplicators.

base/trace_event/heap_profiler_stack_frame_deduplicator.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_TRACE_EVENT_HEAP_PROFILER_STACK_FRAME_DEDUPLICATOR_H_
 #define BASE_TRACE_EVENT_HEAP_PROFILER_STACK_FRAME_DEDUPLICATOR_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 16 matching lines @@
 // lookup of a backtrace for deduplication, and a tree for compact storage in
 // the trace log.
 class BASE_EXPORT StackFrameDeduplicator : public ConvertableToTraceFormat {
  public:
   // A node in the call tree.
   struct FrameNode {
     FrameNode(StackFrame frame, int parent_frame_index);
     FrameNode(const FrameNode& other);
     ~FrameNode();
 
+    size_t EstimateMemoryUsage() const;
+
     StackFrame frame;
 
     // The index of the parent stack frame in |frames_|, or -1 if there is no
     // parent frame (when it is at the bottom of the call stack).
     int parent_frame_index;
 
     // Indices into |frames_| of frames called from the current frame.
     std::map<StackFrame, int> children;
   };
 
@@ skipping 23 matching lines @@
   std::map<StackFrame, int> roots_;
   std::vector<FrameNode> frames_;
 
   DISALLOW_COPY_AND_ASSIGN(StackFrameDeduplicator);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_HEAP_PROFILER_STACK_FRAME_DEDUPLICATOR_H_