[iwyu] Include handles.h less.

test/cctest/heap/heap-tester.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef HEAP_HEAP_TESTER_H_
 #define HEAP_HEAP_TESTER_H_
 
-#include "src/handles.h"
 #include "src/heap/spaces.h"
 
 // Tests that should have access to private methods of {v8::internal::Heap}.
 // Those tests need to be defined using HEAP_TEST(Name) { ... }.
 #define HEAP_TEST_METHODS(V)                              \
   V(CompactionFullAbortedPage)                            \
   V(CompactionPartiallyAbortedPage)                       \
   V(CompactionPartiallyAbortedPageIntraAbortedPointers)   \
   V(CompactionPartiallyAbortedPageWithStoreBufferEntries) \
   V(CompactionSpaceDivideMultiplePages)                   \
@@ skipping 30 matching lines @@
 
 #define THREADED_HEAP_TEST(Name)                                             \
   RegisterThreadedTest register_##Name(v8::internal::HeapTester::Test##Name, \
                                        #Name);                               \
   /* */ HEAP_TEST(Name)
 
 
 namespace v8 {
 namespace internal {
 
+template <typename T>
+class Handle;
+
 class HeapTester {
  public:
 #define DECLARE_STATIC(Name) static void Test##Name();
 
   HEAP_TEST_METHODS(DECLARE_STATIC)
 #undef HEAP_TEST_METHODS
 
   /* test-alloc.cc */
   static AllocationResult AllocateAfterFailures();
   static Handle<Object> TestAllocateAfterFailures();
 
   /* test-api.cc */
   static void ResetWeakHandle(bool global_gc);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // HEAP_HEAP_TESTER_H_