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

runtime/vm/dart_api_message.h

Index: runtime/vm/dart_api_message.h
diff --git a/runtime/vm/dart_api_message.h b/runtime/vm/dart_api_message.h
index c74737ea4770f966287bda54b34c7297bd7b9b07..d2a84e2dd342b6b24a2b8e68beca7bf2f77441c3 100644
--- a/runtime/vm/dart_api_message.h
+++ b/runtime/vm/dart_api_message.h
@@ -41,7 +41,6 @@ struct Dart_CObject_Internal : public Dart_CObject {
   } internal;
 };
 
-
 // Reads a message snapshot into a C structure.
 class ApiMessageReader : public BaseReader {
  public:
@@ -153,7 +152,6 @@ class ApiMessageReader : public BaseReader {
   static _Dart_CObject* singleton_uint32_typed_data_;
 };
 
-
 class ApiMessageWriter : public BaseWriter {
  public:
   static const intptr_t kInitialSize = 512;
@@ -205,7 +203,6 @@ class ApiMessageWriter : public BaseWriter {
   DISALLOW_COPY_AND_ASSIGN(ApiMessageWriter);
 };
 
-
 // This class handles translation of certain RawObjects to CObjects for
 // NativeMessageHandlers.
 //