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

runtime/vm/os_thread_linux.h

Index: runtime/vm/os_thread_linux.h
diff --git a/runtime/vm/os_thread_linux.h b/runtime/vm/os_thread_linux.h
index 4ee247351b8e25f61dd2016f77e69e26e6603b5b..9acc2e394fd0531a9fe8f053ebf4352dc97f46a3 100644
--- a/runtime/vm/os_thread_linux.h
+++ b/runtime/vm/os_thread_linux.h
@@ -20,11 +20,9 @@ typedef pthread_key_t ThreadLocalKey;
 typedef pthread_t ThreadId;
 typedef pthread_t ThreadJoinId;
 
-
 static const ThreadLocalKey kUnsetThreadLocalKey =
     static_cast<pthread_key_t>(-1);
 
-
 class ThreadInlineImpl {
  private:
   ThreadInlineImpl() {}
@@ -41,7 +39,6 @@ class ThreadInlineImpl {
   DISALLOW_COPY_AND_ASSIGN(ThreadInlineImpl);
 };
 
-
 class MutexData {
  private:
   MutexData() {}
@@ -57,7 +54,6 @@ class MutexData {
   DISALLOW_COPY_AND_ASSIGN(MutexData);
 };
 
-
 class MonitorData {
  private:
   MonitorData() {}