cpplint: Remove many unnecessary NOLINT

Now that we updated to upstream cpplint, a lot of these NOLINTs are no
longer necessary.

Bug: 68951293
Change-Id: If8ed5ffe89727f313f907a214b6d8fd2a2eddbad
diff --git a/runtime/base/bit_string.h b/runtime/base/bit_string.h
index 1cda021..a2164f3 100644
--- a/runtime/base/bit_string.h
+++ b/runtime/base/bit_string.h
@@ -248,7 +248,7 @@
 
   // Does this bitstring contain exactly 0 characters?
   bool IsEmpty() const {
-    return (*this) == BitString{};  // NOLINT
+    return (*this) == BitString{};
   }
 
   // Remove all BitStringChars starting at end.