C++ profiles processor: put under #ifdef and fix issues.

src/circular-queue.h

Index: src/circular-queue.h
diff --git a/src/circular-queue.h b/src/circular-queue.h
index dce7fc2ad943b2fe603c59b1f4aab5b18af9edc3..486f10748fdee9a68af978a2d6f1724d49f1c6c8 100644
--- a/src/circular-queue.h
+++ b/src/circular-queue.h
@@ -119,6 +119,8 @@ class SamplingCircularQueue {
   byte* positions_;
   ProducerPosition* producer_pos_;
   ConsumerPosition* consumer_pos_;
+
+  DISALLOW_COPY_AND_ASSIGN(SamplingCircularQueue);
 };