Do not JSON encode the 'result' of a service rpc.

runtime/vm/heap.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_HEAP_H_
 #define VM_HEAP_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/flags.h"
 #include "vm/globals.h"
 #include "vm/pages.h"
 #include "vm/scavenger.h"
 #include "vm/spaces.h"
 #include "vm/verifier.h"
 #include "vm/weak_table.h"
 
 namespace dart {
 
 // Forward declarations.
 class Isolate;
 class ObjectPointerVisitor;
 class ObjectSet;
+class ServiceEvent;
 class VirtualMemory;
 
 DECLARE_FLAG(bool, verbose_gc);
 DECLARE_FLAG(bool, verify_before_gc);
 DECLARE_FLAG(bool, verify_after_gc);
 DECLARE_FLAG(bool, gc_at_alloc);
 
 class Heap {
  public:
   enum Space {
@@ skipping 271 matching lines @@
   GCStats stats_;
 
   // This heap is in read-only mode: No allocation is allowed.
   bool read_only_;
 
   // GC on the heap is in progress.
   bool gc_in_progress_;
 
   int pretenure_policy_;
 
-  friend class GCEvent;
+  friend class ServiceEvent;
   friend class GCTestHelper;
   DISALLOW_COPY_AND_ASSIGN(Heap);
 };
 
 
-class GCEvent {
- public:
-  explicit GCEvent(const Heap::GCStats& stats)
-      : stats_(stats) {}
-  void PrintJSON(JSONStream* js) const;
- private:
-  const Heap::GCStats& stats_;
-};
-
-
 // Within a NoSafepointScope, the thread must not reach any safepoint. Used
 // around code that manipulates raw object pointers directly without handles.
 #if defined(DEBUG)
 class NoSafepointScope : public StackResource {
  public:
   NoSafepointScope();
   ~NoSafepointScope();
  private:
   DISALLOW_COPY_AND_ASSIGN(NoSafepointScope);
 };
@@ skipping 12 matching lines @@
   NoHeapGrowthControlScope();
   ~NoHeapGrowthControlScope();
  private:
   bool current_growth_controller_state_;
   DISALLOW_COPY_AND_ASSIGN(NoHeapGrowthControlScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_HEAP_H_