Remove grab-bag includes of v8.h from everywhere.

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 5693cc16c3c8c9091c465066c4c05d026494bac6..9a984eef9451bc96383f26a68e25ae944b53e76e 100644
--- a/src/heap-snapshot-generator.h
+++ b/src/heap-snapshot-generator.h
@@ -5,7 +5,9 @@
 #ifndef V8_HEAP_SNAPSHOT_GENERATOR_H_
 #define V8_HEAP_SNAPSHOT_GENERATOR_H_
 
+#include "include/v8-profiler.h"
 #include "src/base/platform/time.h"
+#include "src/objects.h"
 #include "src/strings-storage.h"
 
 namespace v8 {
@@ -14,6 +16,8 @@ namespace internal {
 class AllocationTracker;
 class AllocationTraceNode;
 class HeapEntry;
+class HeapIterator;
+class HeapProfiler;
 class HeapSnapshot;
 class SnapshotFiller;