remove Isolate::Current from most files starting with 'f' through 'i'

src/heap-snapshot-generator.h

Index: src/heap-snapshot-generator.h
diff --git a/src/heap-snapshot-generator.h b/src/heap-snapshot-generator.h
index cea995820f70f5194460b4a813b2082fad7d06b1..ccdcab4a36e820ec14aedab842051f030ec1d397 100644
--- a/src/heap-snapshot-generator.h
+++ b/src/heap-snapshot-generator.h
@@ -538,7 +538,7 @@ class NativeGroupRetainedObjectInfo;
 class NativeObjectsExplorer {
  public:
   NativeObjectsExplorer(HeapSnapshot* snapshot,
-                      SnapshottingProgressReportingInterface* progress);
+                        SnapshottingProgressReportingInterface* progress);
   virtual ~NativeObjectsExplorer();
   void AddRootEntries(SnapshotFillerInterface* filler);
   int EstimateObjectsCount();
@@ -570,6 +570,7 @@ class NativeObjectsExplorer {
 
   NativeGroupRetainedObjectInfo* FindOrAddGroupInfo(const char* label);
 
+  Isolate* isolate_;
   HeapSnapshot* snapshot_;
   HeapSnapshotsCollection* collection_;
   SnapshottingProgressReportingInterface* progress_;