Remove unsed header from singleton-inl.h

Summary:
This was recently added by @andrii to provide stack traces,
but it no longer needed since he now produces them from a hook in
folly/experimental/SingletonStackTrace.cpp

Test Plan: Continues to build without the include.

Reviewed By: andrii@fb.com

Subscribers: folly-diffs@, yfeldblum, andrii

FB internal diff: D1842654

Signature: t1:1842654:1423696133:cfa91851f28696082f790eb13c3b0b015c813590

diff --git a/folly/experimental/Singleton-inl.h b/folly/experimental/Singleton-inl.h
index ac515db414d785e18c5a9014e7ea090c40b96958..4b10925199e5a9e8f14fbd24f3c7176c6fe2c687 100644 (file)
--- a/folly/experimental/Singleton-inl.h
+++ b/folly/experimental/Singleton-inl.h
@@ -13,7 +13,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#include <folly/experimental/symbolizer/Symbolizer.h>
 
 namespace folly {