Remove now unused CalculateExactRetainedSize function & сo.

include/v8-profiler.h

Index: include/v8-profiler.h
diff --git a/include/v8-profiler.h b/include/v8-profiler.h
index 5a3a40ff6f6d029cefcdda47205235828bcffb0a..fc3ee78837136a97bee4f212298835a9b00ce1e8 100644
--- a/include/v8-profiler.h
+++ b/include/v8-profiler.h
@@ -284,14 +284,8 @@ class V8EXPORT HeapGraphNode {
    * the objects that are reachable only from this object. In other
    * words, the size of memory that will be reclaimed having this node
    * collected.
-   *
-   * Exact retained size calculation has O(N) (number of nodes)
-   * computational complexity, while approximate has O(1). It is
-   * assumed that initially heap profiling tools provide approximate
-   * sizes for all nodes, and then exact sizes are calculated for the
-   * most 'interesting' nodes.
    */
-  int GetRetainedSize(bool exact) const;
+  int GetRetainedSize() const;
 
   /** Returns child nodes count of the node. */
   int GetChildrenCount() const;