Revert "Heap profiler clean-up: remove unused methods"

This reverts commit 63fd24a7c0782ccc3221803e3a2740f1e1b92ceb. Broke compilation on Mac.

TBR=loislo@chromium.org, yangguo@chromium.org

Review URL: https://codereview.chromium.org/684883002

Cr-Commit-Position: refs/heads/master@{#24948}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24948 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/heap-snapshot-generator.h

@@ -332,6 +332,7 @@ class V8HeapExplorer : public HeapEntriesAllocator {
                  v8::HeapProfiler::ObjectNameResolver* resolver);
   virtual ~V8HeapExplorer();
   virtual HeapEntry* AllocateEntry(HeapThing ptr);
+  void AddRootEntries(SnapshotFiller* filler);
   int EstimateObjectsCount(HeapIterator* iterator);
   bool IterateAndExtractReferences(SnapshotFiller* filler);
   void TagGlobalObjects();
@@ -472,6 +473,7 @@ class NativeObjectsExplorer {
   NativeObjectsExplorer(HeapSnapshot* snapshot,
                         SnapshottingProgressReportingInterface* progress);
   virtual ~NativeObjectsExplorer();
+  void AddRootEntries(SnapshotFiller* filler);
   int EstimateObjectsCount();
   bool IterateAndExtractReferences(SnapshotFiller* filler);