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

runtime/vm/unicode.h

Index: runtime/vm/unicode.h
diff --git a/runtime/vm/unicode.h b/runtime/vm/unicode.h
index 511686381f0fb749b32d707085c766eb4beea450..23b64b7bac5332d3065f19d6ed199c0d3fd3bfc5 100644
--- a/runtime/vm/unicode.h
+++ b/runtime/vm/unicode.h
@@ -34,7 +34,6 @@ class Utf : AllStatic {
   }
 };
 
-
 class Utf8 : AllStatic {
  public:
   enum Type {
@@ -106,7 +105,6 @@ class Utf8 : AllStatic {
   static const uint32_t kOverlongMinimum[];
 };
 
-
 class Utf16 : AllStatic {
  public:
   // Returns the length of the code point in UTF-16 code units.
@@ -158,7 +156,6 @@ class Utf16 : AllStatic {
   static const int32_t kSurrogateOffset = (0x10000 - (0xD800 << 10) - 0xDC00);
 };
 
-
 class CaseMapping : AllStatic {
  public:
   // Maps a code point to uppercase.