VM: Re-format to use at most one newline between functions

runtime/vm/json_stream.h

Index: runtime/vm/json_stream.h
diff --git a/runtime/vm/json_stream.h b/runtime/vm/json_stream.h
index 6997b4e25a4ba1a928b3e72b2bcbe71b985abab5..a33c7cb95a6fed441f4ce7240a9b4a93452cefb2 100644
--- a/runtime/vm/json_stream.h
+++ b/runtime/vm/json_stream.h
@@ -11,7 +11,6 @@
 #include "vm/service.h"
 #include "vm/token_position.h"
 
-
 namespace dart {
 
 class Array;
@@ -34,7 +33,6 @@ class Thread;
 class ThreadRegistry;
 class Zone;
 
-
 // Keep this enum in sync with:
 //
 //  - runtime/vm/service/vmservice.dart
@@ -255,7 +253,6 @@ class JSONStream : ValueObject {
   friend class JSONArray;
 };
 
-
 class JSONObject : public ValueObject {
  public:
   explicit JSONObject(JSONStream* stream) : stream_(stream) {
@@ -369,7 +366,6 @@ class JSONObject : public ValueObject {
   DISALLOW_COPY_AND_ASSIGN(JSONObject);
 };
 
-
 class JSONArray : public ValueObject {
  public:
   explicit JSONArray(JSONStream* stream) : stream_(stream) {