Fix cpplint whitespace/blank_line issues

Change-Id: Ice937e95e23dd622c17054551d4ae4cebd0ef8a2
diff --git a/runtime/gc/accounting/space_bitmap.cc b/runtime/gc/accounting/space_bitmap.cc
index 19f1128..6edc067 100644
--- a/runtime/gc/accounting/space_bitmap.cc
+++ b/runtime/gc/accounting/space_bitmap.cc
@@ -64,9 +64,7 @@
 }
 
 // Clean up any resources associated with the bitmap.
-SpaceBitmap::~SpaceBitmap() {
-
-}
+SpaceBitmap::~SpaceBitmap() {}
 
 void SpaceBitmap::SetHeapLimit(uintptr_t new_end) {
   DCHECK(IsAligned<kBitsPerWord * kAlignment>(new_end));