Remove bottom-up CPU profile

include/v8-profiler.h

Index: include/v8-profiler.h
diff --git a/include/v8-profiler.h b/include/v8-profiler.h
index c9eab3f1f5f3a8447a1fdc0365ada3f556dbcbbb..32a35fd8bd874fd9b55fc7008907370475d1c74e 100644
--- a/include/v8-profiler.h
+++ b/include/v8-profiler.h
@@ -116,9 +116,8 @@ class V8EXPORT CpuProfileNode {
 
 
 /**
- * CpuProfile contains a CPU profile in a form of two call trees:
- *  - top-down (from main() down to functions that do all the work);
- *  - bottom-up call graph (in backward direction).
+ * CpuProfile contains a CPU profile in a form of top-down call tree
+ * (from main() down to functions that do all the work).
  */
 class V8EXPORT CpuProfile {
  public:
@@ -128,9 +127,6 @@ class V8EXPORT CpuProfile {
   /** Returns CPU profile title. */
   Handle<String> GetTitle() const;
 
-  /** Returns the root node of the bottom up call tree. */
-  const CpuProfileNode* GetBottomUpRoot() const;
-
   /** Returns the root node of the top down call tree. */
   const CpuProfileNode* GetTopDownRoot() const;